. Annali della South African Museum = Annale van die Suid-Afrikaanse museo. Storia naturale. La parte anatomica del capo ROCK LOBSTER 47 estremità laterale della scanalatura cervicale, dove termina circa in corrispondenza del livello dell'anteriore apodeme mandibolare. Tutte le fibre sono attaccate al carapace e vengono inseriti sulla parte interna, margine dorsale della piastre epimeral opposta al limite superiore del rivestimento del branchiostegite. Tutto il nastro è chiaramente divisibile in una superficie esterna o serie laterali di fibre corte e una fila interna di un po' più a lungo e più fibre mediale e, come quest'ultimo è interrompere

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. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. THE ANATOMY OF THE CAPE ROCK LOBSTER 47 lateral end of the cervical groove, where it terminates approximately at the level of the anterior mandibular apodeme. All the fibres are attached to the carapace and are inserted on the inner, dorsal margin of the epimeral plates opposite the upper limit of the lining of the branchiostegite. The whole strip is clearly divisible into an outer or lateral series of short fibres and an inner row of somewhat longer, more medial fibres and, as the latter is interrupted at the level of the transverse part of the cervical groove, it is separable into an anterior portion coinciding with the lateral region of the cervical groove and a posterior part which is located beneath the branchio-cardiac groove. These subdidsions are respectively comparable to the lateral, anterior, and dorsal heads of the epimeral attractor muscle of Procambarus, in which Pilgrim & Wiersma (1963) have also distinguished an antero-ventral, a pos- terior, and a receptor head. There can be little doubt that the latter is also present in Jasus, but no particular study was made of stretch receptors and their associated muscles. The antero-ventral head does not seem to be differen- tiated in J. lalandii, and there is some resemblance between the posterior head of the epimeral attractor muscle o^ Procambarus and one of the muscles, perhaps the transverse muscle, herein assigned to the wall of the pericardial pouch (P- 135)- It is also of interest to note that the short musculns contractor epimeralis, which Schmidt (1915) defined in Astacus and reported in Homarus, was not observed in Jasus. Alexandrowicz (1952) has also remarked that it is wanting in Palinurus elephas (Fabr.), and Pilgrim & Wiersma (1963) have attributed its non- existence in Panulirus interruptus to the absence of an uncalcified medial epimeral hinge that occurs in forms possessing this muscle. cer

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• bookcentury1800
• bookdecade1890
• booksubjectnaturalhistory
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