. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. THE ANATOISIY OF THE CAPE ROCK LOBSTER 23 the proepistoma, Avhile Snodgrass (1951) defined it as the head plate in Panulirus argus. Underlying the eyestalk and the pedate process and curving forward to meet the frontal tubercle, there is a broad transverse plate to which the basal segment of the antennal peduncle is attached dorsally by an arthrodial mem- brane. While Huxley (1881) regarded it as the antennulary epimeron in Astacus, it seems as though it may be interpreted equally well as the epimero
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. THE ANATOISIY OF THE CAPE ROCK LOBSTER 23 the proepistoma, Avhile Snodgrass (1951) defined it as the head plate in Panulirus argus. Underlying the eyestalk and the pedate process and curving forward to meet the frontal tubercle, there is a broad transverse plate to which the basal segment of the antennal peduncle is attached dorsally by an arthrodial mem- brane. While Huxley (1881) regarded it as the antennulary epimeron in Astacus, it seems as though it may be interpreted equally well as the epimeron of the antennal segment (fig. 3) and, as previously suggested, it probably forms the fi-ontal tubercle with which the dorso-medial articulation of the antenna takes place. supralabral ridge excretory pore mandibular epimeron epimer epimeron 2nd halant aperture andibIe left panagnath reflected 1st max. andibular condyle sed maxillary paraphrogms cond maxillary socket first thoracic epimeron Fig. 4. Ventral view of mouth region; the left first maxilla has been reflected to show the metastoma and the paragnath, and the branchiostegite on each side has been removed to expose the roof of the prebranchial chamber. On each side of the mandibular segment, the epimeron (figs 2,4) is repre- sented by the anterior two-thirds of the thin, arched roof of the prebranchial chamber. Towards its posterior limit the condyle of the mandible articulates with it, while anteriorly it lies beneath the anterior mandibular apodeme and unites with a transverse extension of the epistoma which forms the upper boundary of the exhalant aperture of the respiratory system and has been called the wing of the epistoma by Snodgrass (1951, 1952). The first and second maxillary epimera are indistinctly demarcated from each other, but the former (figs 3, 4) may be manifest in a narrow ridge \vhich separates the mandibular epimeron from the second maxillary epimeron. The latter (figs 2-4) is a fairly broad p
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
