16 



dage is very slender, and is considerably shorter than in the 

 female. 



The succeeding pairs of pleopods are all well developed, and 

 possess an appendix interna, and in the male the second pair 

 have also an appendix masculina. 



The uropods are large and broad, the exopodite more so than 

 the endopodite. The margins are entire and fringed with long 

 setae. In the endopodite there is a midrib extending to the tip, 

 and in the exopodite two similar ribs, neither of which reach the 

 margin. 



Occasionally in the female there may be seen two spermato- 

 phores cemented firmly to the sternal surface between the coxae 

 of the fourth and fifth pereiopods. These are not unlike the 

 spermatheca which is found in certain Decapods in the same 

 position, and in P. sculptus they have erroneously been described 

 as such (see Andrews, 1911). 



Size : — Senna (1903) mentions three large females, taken in 

 the Mediterranean, which measured 65, 70, and 90 mm. The 

 largest specimens taken by the Helga are two females, each 80 

 mm. long. Another female measures 74 mm. 



The following measurements are taken from a female from 

 station S. R. 490. 



Total length 

 Length of carapace 

 Length of abdomen 

 Breadth of carapace 

 Length of chelipeds 

 Length of ischium of chelipeds 

 Length of merus of chelipeds 

 Length of carpus of chelipeds 

 Length of propodite of chelipeds 

 Length of palm of chelipeds 

 Length of fingers of chelipeds 

 Length of second pereiopods 

 Length of third pereiopods 

 Length of fourth pereiopods 

 Length of fifth pereiopods 

 Length of antennules . . 

 Length of antennae 



.. 80 



mm 



. . 35 



mm 



.. 45 



mm 



.. 23 



mm 



.. 81 



mm 



.. 13 



mm 



.. 26-5 



mm 



. . 13-5 



mm 



. . 27-5 



mm 



. . 12 



mm 



.. 15-5 



mm 



. . 32 



mm 



. . 28 



mm 



. . 26 



mm. 



. . 22 



mm, 



. . 43 



mm. 



. . Brok 



.en. 



General Distribution : — The species was taken originally in 

 the Mediterranean, and was described by Heller (1862 and 1863). 

 It has since been recorded from Sicily (Heller, Riggio), Sardinia 

 (Senna), the Adriatic, north coast of Africa, south coast of 

 Asia Minor, and Crete (Adensamer). Under the name of P. 

 Agassizi it has been recorded from several localities in West 

 Indian waters (Milne Edwards), and Bouvier has shown that 

 it is widely distributed in the eastern Atlantic. Kemp (1912) 



