Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 25 



closely allied to tlie typical P. ciliata Fabricius, which is known from 

 the Indo-Pacific region, Philippines, Hawaii, Fiji Islands, Loyalty 

 Islands, New Britain, Australia and a few other localities in Oceania. 



Material examined : Five specimens from the Florida Keys, March, 

 1924; five specimens dredged in 30 fms., southwest of the Marquesas 

 Keys, Florida, March 2, 1924. 



Habits : This species is abundant in the rock crevices of the West 

 Indian coral reefs, and while it is chiefly nocturnal, swimming about 

 and procuring its food at night, it is also occasionally found swimming 

 during the day, its powerful caudal fan and abdominal appendages 

 enabling it to propel itself rapidly and gracefully. 



Color: The coloration of this species, resembling G. oerstedii, is 

 very variable. The males are usually bright grass green with a cast 

 of peacock blue, especially on the retrochela and caudal fan ; the ap- 

 pendages are margined and tipped with carmine. The females are less 

 vividly colored, as are also the young males, both of which forms fre- 

 quently appear olivaceous with marblings of yellowish or brownish. 



Technical description: Rostrum wider than long, produced to a 

 slight median point, with the fronto-lateral margins evenly convex; 

 the carapace is convex, smooth, except for the longitudinal lateral 

 groove on each side, frontal margin much less excavate than that of 

 G. oerstedii; anterolateral margins rounded but scarcely at all pro- 

 duced; posterolateral margins also rounded; posterior margin rela- 

 tively straight. The visible thoracic and first five abdominal segments 

 are smooth. The third abdominal segment is very short and narrower 

 than the others, its epimeral margin rounded; the fourth, fifth and 

 sixth abdominal segments are approximately equal with the lateral 

 margins rounded, but slightly different ; the fourth being quite blunt 

 and broad, the fifth more convex, and the sixth more tapered, sub- 

 acute. The first, second, third and fourth abdominal segments are 

 subequal in length and all have the lateral margins truncated, the first 

 segment having a rounded, flap-life process anteriorly. The fourth 

 segment is said by Borradaile to have no tooth at its postlateral angle, 

 but of the eight specimens before me from southern Florida, only one 

 has no spine at this angle and it is a small young specimen ; one speci- 

 men has a spine at this angle on the right side but none on the left, 

 this is also a small specimen; the other six specimens ranging from 

 small to large have a small, short, acute spine at the postlateral angle 



