IQ22.J 



S. Kemp : Notes on Crustacea Decapoda. 



187 



The antennal and hepatic spines are well developed, the latter 

 being on. a much lower level than the former. 1 



The eye is small and slender. In dorsal view the stalk is 

 swollen at the base and broader than the hemispherical cornea." 

 There is a small ocular spot, placed close to the cornea but isolated 

 from it. 



The lateral process of the basal segment of the antennule 



(text-fig. 40a) leaches a little 

 beyond the middle of the 

 segment. Distally the basal 

 segment projects beyond the 

 articulation with the second 

 and bears a small spine ex- 

 ternally. The free portion 

 of the shorter ramus of the 

 outer flagellum is rather 

 longer than the fused part, 

 the latter consisting of 5 to 

 9 segments, most commonly 

 5 or 6. The outer margin 

 of the antennal scale (text- 

 fig. 406) is slightly convex, 

 terminating in a small spine 

 which does not reach nearly 

 as far forwards as the some- 

 what pointed apex of the 

 lamella. In large specimens 

 the scale is rather less than 

 2*5 times as long as wide. 



The second maxilliped 

 does not possess a podo- 

 branch. The third maxil- 

 liped is short and slender ; 

 it bears an arthrobranch and the exopod reaches to the middle of 

 the penultimate segment. The ultimate segment is a little shorter 

 than the penultimate. 



The first, peraeopods (text-fig. 41a) reach beyond the end of 

 the scale by fully half the length of the chela. The merus is slightly 

 longer than the carpus, the carpus distinctly longer than the chela ; 

 the fingers are unarmed and are about equal in length with the 

 palm. The second peraeopods (text-fig. 41b) may reach beyond 

 the scale by the whole of the chela and carpus in adult males ; in 

 females and young males they are slightly shorter. The legs of a 

 pair are similar both in structure and size and except that they 

 are longer in the male, there is no difference between the sexes. 



1 Nobili's remark that the hepatic spine is placed further forwards in his 

 specimens than in Schenkel's is not borne out by his figures or by his specimen 

 from the. Persian Guif. 



2 In the figure the eye is greatly fore-shortened with the result that the 

 cornea appears broader than the stalk. 



TEXT-PIG. 40. — Periclimenes brevicarpalis 

 (Schenkel). 



a. Antennule. 



b. Antennal scale. 



