220 



Key to the Species of the Subgen us Plastocrangon Alc, hitherto known. 



a x The anterior half of the 4 th or lateral crest of the carapace ends 



in a huge, vertically compressed, wing-like spine, lying behind 



and outside the branchiostegal spine, and projecting far beyond 



the anterior border of the carapace. 



b x The anterior half of the 4 th or lateral crest of the carapace has 



no spine but the large spine aforesaid : postenor half of 3 rd or 



dorso-lateral crest entire caeca W.-Mas. 



ö.., The anterior half of the 4 th or lateral crest of the carapace is 



cut into two portions, of which the anterior is the large spine 



aforesaid : posterior half of 3" 1 or dorso-lateral crest cut into 



two lobes cerea Alcock& Andersom 



(A. Alcock, 1. c, 1901, p. 136.) 



a s The anterior half of the 4 111 or lateral crest of the carapace is cut 

 into two small teeth, of which the anterior falls far short of the 

 anterior border of the carapace. 

 b x Rostrum armed on either margin with three spines. Carapace and 



abdomen crisply tubercled caecescens W.-Mas. 



(A. Alcock, 1. c, 1901, p. 133.) 

 b„ Rostrum armed on each margin with two spines. Carapace and 

 abdomen not crisply tubercled. 

 Branchiostegal spine directed straight, horizontally, forward, twice 



as long as the orbital spine Faxoni de Man 



1. Glyphocrangon regalis Bate. PI. XVIII, Fig. 54 — 54/Ê. 



Glyphócrangon regalis C. Spence Bate, Report Challenger Macrura, 18S8, p. 517, PI. XCIIL. 



%• 3. 4- 

 ? Glyphocrangon investigatoris J. Wood-Mason, in: Ann. Mag. Nat. Hist. Febr. 1891, p. 191 j_ 



and variety andamanensis J. Wood-Mason, ibidem, Nov. 1891, p. 356. 

 ? Glyphocrangon investigatoris A. Alcock, A descript. Catal. Indian Deep-Sea Crustacea, Calcutta 



1901, p. 127. 

 ? Illustrations of the Zoology of the Investigator, Crustacea, PI. VI, figs. 3, 2. 



Stat. 38. April 1. 7°35'.4S., ii7°28'.6E. Paternoster-islands. 521 m. Bottom coral. 1 adult 



egg-bearing and 1 young female. 

 Stat. 45. April 6. 7°24'S., u8°i5'.2E. North of Sumbawa. 794 m. Bottom fine grey mud,- 



with some radiolariae and diatomes. 1 young specimen. 

 Stat. 74. June 8. 5°3'.5S., 119° o' E. Off Makassar. 450 m. Bottom Globigerina ooze. 1 male 



of medium size and 1 full-grown female with eggs. 



These specimens certainly belong to Glyph. regalis Bate, of which the type was taken 

 off Banda Island at a depth of 200 fathoms. According to Spence Bate (1. c. p. 5 1 8) the 

 branchial region should be free from tuberculations, in the present specimens, however, it is- 

 distinctly granular, except in the two young individuals. One observes, indeed, between the 



