.370 ''ENDEAVOUR" SCIENTIFIC RESULTS. 



BATE: as a plate not in contact with the lobes." In 

 occasional, possibly not fully mature, specimens of P. 

 1 at i. ml cat us the horns of the anterior part of the median 

 protuberance of the thelycum are rather small and close 

 together, approaching those of P. plebejus in size and 

 shape; in this latter species they also show some varia- 

 tion, being in some cases almost absent, merely sug- 

 gested (knobs) but most often of a size equalling those 

 in such variants as P. latixulcat-us that have the small 

 horns described by de Man for P. plebejus. 



Size. The type of this species, which de Man 

 recently ( op. cit., p. 110) re-examined is "nearly 15 cm. 

 long," but most of the "Endeavour" specimens are quite 

 a bit larger, ranging from 14-3 to 20-5 cm. in length, the 

 average of the 28 specimens being about 17-2 cm. ; but one 

 specimen was less than 15 cm. long. 



PENEUS MACcuLLOCHi, 53 ncic species. 

 (Plate Ixvi., figs. 1-3.) 



Type locality. 1H miles N.E. of North Reef, Queens- 

 land, 70-74 fathoms; one male, holotype (Reg. No.E.6619). 



Description. This species appears to be closely 

 related to P. plebejus Hess, in possessing a secondary or 

 accessory pair of lateral rostral carina?, and having a 

 doable "loop" at the posterior end of the post-ocular 

 ridge. Laterally as in that species, the telson is armed 

 with three pairs of spinules. 



The post-rostral carina extends backward nearly to 

 the posterior margin of the carapace and is silicate 

 posterior to the last rostral tooth. The latter is situated 

 a little in front of the middle of the carapace. However, 

 .distinguishing this species from all others is the inter- 

 ruption of the post-rostral carina at the middle of the 

 posterior third of the carapace by a running together or 

 crossing over of the lateral rostral grooves to form an 

 X-shaped depression ; before, this embraces the posterior 

 end of the anterior portion of the sulcated post-rostral 

 carina, and behind, it embraces likewise the sulcate, cut 

 off, posterior end of the dorsal carina. The cervical 



53 Named for the late Allan R. McCulloch, formerly Zoologist at 

 the Australian Museum. 



