1 1 



with about six hooks of middle size. Lobus armatus {la.) is of moderate size, thick at the base 

 and tapers to the end; it has a good number of hooks along the inner side from rather near 

 the base to the end, and a few hooks on the front side near the end. Lobus connectens (/e.) 

 is not half as long as lobus armatus and as thick as processus ventralis at the middle ; it has 

 a good number of hooks on most of its anterior side and a few on the posterior side. Lobus 

 terminalis (//.) is long, straight, a little tapering, with about four hooks spread along the outer 

 margin and three hooks at the most distal part of the inner margin. Lobus inermis (//.) is 

 long, thicker than the other lobes, somewhat curved, distally tapering to the obtuse end, with 

 about four hooks at the distal part of the outer margin and three large hooks at the distal 

 part and the end of the inner margin. 



Remarks. — ■ In possessing a very distinct protuberance on the eye-stalks near the 

 cornea S. Gardineri agrees with 6". Kröyeri Bate, but differs from all other species of this 

 sub-group (in the other sub-group, comprising S. cornimlum Kr. and S. semimidus n. sp., a 

 distinct protuberance is less or more developed). 5. Gardineri differs from 5. Kröyeri in being 

 much smaller, in having the protuberance mentioned much lower and of another shape, in a 

 totally differently formed rostrum, and other particulars. The petasma in 5. Kröyeri has never 

 been described; that in S. Gardineri differs from those hitherto known of the species in group I 

 in three features, viz. the shape of the subterminal incision in processus uncifer, the occurrence 

 of hooks on the end of processus ventralis, and the existence of hooks on lobus inermis. 



Distribution. — Kemp recorded several specimens from three localities in the western 

 part of the Indian Ocean somewhat south of the line, two among them in depths between 

 750 and 500 fathoms. 



4. Ser gestes bisulcatns Wood-Mason. PI. I, figs. $a — T,d. 



1891. Sergestes bisulcatus Wood-Mason, Ann. Mag. Nat. Hist. 6 ser. Vol. VII, p. 190. 



1901. Sergestes bisulcatus Alcock, Illustr. Zool. Investigator, PI. L, figs. 1, la, ïb. 



1901. Sergestes bisulcatus Alcock, Descr. Cat. Indian Deep-Sea Crust. Dec. Macrura and 

 Anomala, p. 49. 



Stat. 46a. April 7. Lat. 8° o'. 5 S., long. u8°34'.7E. 1600 m. Deep sea trawl. 1 adult female. 

 Stat. 185. Sept. 12. Lat. 3° 20' S., long. i27°22'.9E. Manipa Strait. Hensen vertical net, 



from 1536 m. to surface. 1 adult male. 

 Stat. 217. Oct. 31. Lat. 6°4o'.6S., long. 123° I4'.7 E. 2477 m. Deep sea trawl. 1 immature 



specimen. 



In general aspect somewhat similar to S. robustus S. I. Smith. Alcock has published 

 a description which on the whole agrees well with the "Siboga" specimens and with a co-type 

 received by the Copenhagen Museum many years ago from the Museum in Calcutta. Here it 

 may be sufficiënt to mention some particulars and describe the petasma. 



The rostrum is somewhat ascendant (fig. 3), moderately long, acute; the lower margin 

 has its distal third or nearly more than its distal half feebly or somewhat concave, while the 

 upper margin is a little or slightly convex or feebly angular beyond the middle. The eyes are 

 large, nearly as long as broad, distinctly depressed, much broader than the stalk and slightly 



