36 



Sea oft" the Travancore coast, has also been obtained by the "Siboga": a large number of 

 well-preserved specimens of unequal size, adult, half-grown and young, were taken by this 

 expedition both in the Bali Sea and between Rotti and Timor. The other species, Piier7tlus 



m 



carijiafus, was described in 1910 by Borradaile after an adult male specimen, long 19 cm., 

 that was dredged by the Percy Sladen Trust Expedition oft" Saya de Maiha bank : this species 

 is most closely related to the preceding, but the two teeth behind the large supra-orbital teeth 

 reach farther backward, almost to the cervical groove, the telson is shorter and there are still 

 a few other slight differences. 



As has already been pointed out by Dr. Calman, in : The Annals and Mag. Nat. Hist. 

 Vol. Ill, Ser. 8, 1909, p. 441, Piicnilus Ortm. is a valid genus, characterized, together with 

 Linuparjis White, by the pleopods of the 2"'^ abdominal somite of the female resembling those 

 of the three following somites and by the prismatic form of the carapace, and distinguished by 

 these characters from Paliiiitrus Fabr. (s. s.), Jasjts Parker and Paiui/irits White. In its outer 

 appearance, however, the genus Pucnilits also much resembles Paliiinriis and in this connection 

 I wish to call attention to the fact that in Piter, angiilatus sometimes a rostrum, though 

 very small, is observed, as is the case with several specimens collected by the "Siboga" 

 and that, like in Pa/iiiiirus^ the epistome is longitudinally furrowed and the antennular flagella 

 short. But I should not wonder that the genus Puerithis once will prove to be identical with 

 the genus Palinnshis A. M.-Edw., about the single species of which, PaliimsUis triincatus 

 A. M.-Edw., from the West-Indies, we are now quite well informed by the important monograph 

 of A. Gruvel, who, however, did refer this species to the genus Palimtrits P^abr. s. s. The 

 carapace oi Palimtstits iriincatiis bears one median and two lateral carinae, so that 

 it appears rather more quadrangular than rounded ( " qui lui donnent plutot u n 

 aspect carre qu'arrondi", A. Gruvel, 1. c. p. 19). The antennular tergum is unarmed. The 

 supra-orbital teeth are represented in Paliiiusttis tnincatiis by a lamella, truncate and cut into 

 teeth anteriorly, behind this lamella one observes a large tooth or spine, that is followed by 

 two smaller ones: the lamelliform supra-orbital teeth may perhaps be regarded as homologous 

 with the denticulate prominence which in J'ucr. angn/afus is usually found at the inner side 

 ot the supra-orbital teeth. The epistome shows the same form and characters and differs only 

 by there being three teeth in the middle of the anterior margin \n Palmustns trtmcahis^m'St&did 

 ot one single tooth in J'licr. aiigula^ns. Unfortunately the characters of the pleoiDods were not 

 described by Gruvel, but he also considers this species already to be a primitive form of the 

 genus Paliniiriis; when the pleopods of the 2"-^ abdominal somite of the female should indeed 

 resemble those of the three following- somites, then the oenus PiicriLlus should be regarded as 

 identical with the genus Palinustus. 



Both species of Pucrtihts occur in deep water, Pucr. angitlafits having been obtained 

 at depths varying between 143 and 719 fathoms, while Pucr. ca?-hiafiis \\3.s dredged in 125 fathoms. 



I. Pitern/ns angitlatiis (Sp. Bate). (PI. II, Fig. 5 — 5<^). 



Pauiilinis angitlatiis C. Spence Bate, Report Challenger Macrura, 18S8, p. Si, PI. XI, figs. 2, 3, 4. 

 Piwr aiigiilatiis A. E. Ortmann, in: Zoolog. Jahrb. Abth. f. Syst. VI, iSgi, p. 37. 



