356 "ENDEAVOUR" SCIENTIFIC RESULTS. 



distal margins of the lateral lobes. The size of these 

 median teeth seems to vary with age, in young small 

 specimens being possibly a little below the most distal 

 points of the lateral lobes of the petasma; and in 

 older, larger, more mature specimens, rising above or 

 beyond that level. In a male 70 mm. long from Kago- 

 shima, Japan, these teeth do project slightly; in two 

 males from Aomori, Rikuoku, Japan, they are about on a 

 part with the lateral lobes ; while in the lone male taken 

 by the ''Endeavour," they are if anything possibly a 

 little shorter. The lateral lobes of the petasma figured 

 by Bate are represented as being much bowed up, and for 

 that reason only may exceed the median teeth. The 

 petasma portrayed by Alcock, I feel sure is a misrepre- 

 sentation on the part of the artist; it is not unlike, in 

 appearance, the sketch given by Ortmann. Unfortunately 

 Alcock makes no written comment on either the petasma 

 or his figure of it. 



I believe that until more valid differences are 

 brought forward to distinguish T. asper and de Man's 

 ancJioraUs from T. cttn-'iroxtris, they had better be united. 



Though it might, later appear that Alcock's 

 specimens ranging in size up to 3-5 inches (nearly 90 

 mm.) in length, represent an Indian Ocean variety or 

 subspecies asper with longer fifth legs, a much fainter 

 post-rostral carina and sharper antero-lateral angles of 

 the carapace, it should be borne in mind that de Man's 

 comparatively immature specimens of 52 mm. and less, 

 with legs and rostral teeth much as in T. asper, and quite 

 distinct post-rostral carina nearly to the posterior 

 margin of the carapace, have the thelycum and petasma 

 much as in T. curvirostris', while the three "Endeavour" 

 specimens, from 37 to about 50 mm. in length, which 

 also exhibit a tendency toward comparatively longer legs, 

 have straighter rostra, and have in the two specimens 

 with complete rostra the exact number of rostral teeth 

 of typical T. curvirostris, and though carinated for a 

 longer or shorter distance following the tip of the 

 epigastric tooth, in none of the three specimens does the 

 carina run on to, if as far as, the posterior half of the 

 carapace. 



Otherwise, the only small specimens of T. currirostris 

 I have seen are two females from northern Japan 33 

 and 41 mm. long. They have the fifth legs longer than 



