2 20 



Key to the" Species of the Subgenus P/astocrajigon Ale, hitherto known. 



«j The anterior half of the 4''' 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. 



6■^ The anterior half of the 4"' or lateral crest of the carapace has 



no spine but the large spine aforesaid : posterior half of 3'''^ or 



dorso-lateral crest entire caeca W.-Mas. 



d.. The anterior half of the 4''' or lateral crest of the carapace is 

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

 aforesaid : posterior half of 3'''^ or dorso-lateral crest cut into 



two lobes r^r^a Alcock& Andersork 



(A. Alcock, I.e., 1901, p. 136.) 



a„ The anterior half of the 4''* 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. 

 d^ Rostrum armed on either margin with three spines. Carapace and 



abdomen crisply tubercled caecescens W.-Mas. 



(A. Alcock, I.e., 1901, p. 133.) 

 A, 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 



I. Glyphocrango7i regalis Bate. PI. XVIII, Fig. 54 — 54 /t. 



Glypliocrangon regalis C. Spenee Bate, Report Challenger Macrura, 18SS, p. 517, PI. XCIII,. 



fig- 3. 4- 

 '^.Glypliocrangon invcstigatoris J. Wood-Mason, in: Ann. Mag. Nat. Hist. Febr. 1891, p. 191 ; 



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

 r Glypliocrangon investigatoris A. Alcock, A descript. Catal. Indian Deep-Sea Crustacea, Calcutta 



1 90 1, p. 127. 

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



Stat. 38. April i. 7° 35^4 S., II7°28'.6E. Paternoster-islands. 521 m. Bottom coral, i adult 



egg-bearing and i young female. 

 Stat. 45. April 6. 7°24'S., ii8°i5'.2E. North of Sumbawa. 794 m. Bottom fine grey mud, 



with some radiolariae and diatomes. i young specimen. 

 Stat. 74. June 8. 5°3'.5S., ii9°o'E. Oil' Makassar. 450 m. Bottom Globigerina ooze, i male 



of medium size and i 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 B.\te (1. c. p. 5 1 S) 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 



