332 "ENDEAVOUR" SCIENTIFIC RESULTS. 



only specimens of P. inter medius were both 120 ram. 

 long. The largest female of P. endear fturl is 175 mm. 

 long, and the largest male 140 mm. 



The rostrum of the female holotype is 20-5 mm. long, 

 the carapace 35-5, and the abdomen and telson together 

 about 101 mm. long, making a total length of about 157 

 mm., though the extreme tip of the telson is lacking. The 

 telson is about 21 mm. long, and the sixth abdominal 

 somite 21 mm. to the tip of the posterior median spine. 

 The height of this somite, measured at the middle of its 

 length, is 17 mm., and its greatest width at the same 

 point is 9-5 mm. 



Remarks. P. endeavouri belongs to that group of 

 Penseopsi having lateral spines on the telson, symmetrical 

 petasmas, and no exopodites on the last pair of legs, 

 which in the adult male have a notch and a tooth or 

 spine near the proximal end of their meral joints, such 

 as is characteristic of P. inonoceros. 23 



To this group belong P. ens-is (de Haan), 24 P. inter- 

 medius (Kishinouye), 25 P. stcbbitiffi (Nobili), 26 P. 

 macleayi (Haswell), 27 and doubtfully P. cognatus 

 (Nobili), 28 the male of which is still unknown. 



De Man 29 has recently given a few differential 

 characters tending to separate P. ensis (de Haan) from 

 P. intennedius (Kishinouye). "Peneopsix ensis (deHaan) 

 from Japan differs from both the typical Pen. intermedia 

 and the variety anchista by an obtuse crest which from 

 the hepatic spine runs backward to the posterior margin 

 of the carapace, and furthermore by the stronger carina- 

 tion of the abdomen ; the posterior half of the 2nd tergum 

 is crested, there is a distinct flattened keel on the 3rd, 

 while the 4th to the (Jth terga are sharply carinated. In 

 Pen. ensis the rostrum is slightly turned upward, the 

 two posterior spinules of the telson are rather long like 



Z! Cf. Alcock, Cat. Indian Decapod Crust., 1906, pt. iii., fasc. i., 

 p. 50. 



24 Cf. De Man, Zool. Medd. Rijks. Mus. Nat. Hist, v., 1920, p. 104. 



-"Jour. Pish. Bur. Tokyo viii., 1900, p. 21. 



-"Bull. Mus. Hist. Nat., Paris. 1909, No. 5, p. 229; Ann. Sci. 

 Nat. (9), Zool. iv., 1906, p. 15, pi. i., fig. 2. Tattersall, Jour. Linn. 

 Soc. London, xxxiv., 1921, p. 365, pi. xxvii., figs. 7-10 and pi. xxviii., 

 lig. 13. 



2 'Proc. Linn. Soc. N.S.W. iv., 1, 1879, p. 40; Cat. Austral. Crust., 

 1882, p. 201. 



^ Bull. Mus. Hist. Nat., Paris, 1904, No. 5, p. 229; Ann. Sci. 

 Nat. (9), Zool. iv., 1906, p. 14, pi. i., fig. 1. 



-"Zool. Medd. Rijks. Mus. Nat. Hist., v., 1920, p. 104. 



