72 



Genus II. — Chekaphiltjs (Mihi), X6/)as (piXof. 



(Pontophilus of Leach, abandoned by that author, and the name sub- 

 sequently applied to genera of the Pandalidse, by Eisso and De Haan.) 



Rostrum triangular, moderate; carapace carinate; gastric region 

 armed with one or more carinse; branchial region multicarinated ; 

 abdominal somites carinated and sculptured; telson sulcated above; 

 first pair chelipeds robust, moderate in length ; second shorter than 

 first : antennae as family ; antennal scale short. British Species : Ch. 

 bispinosus, trispinosus, Pattersonii, spinosus. 



In addition may be noted, accessory scale of antennae moderate, not 

 twice length of peduncle of antennae ; second pair of chelipeds much 

 shorter than third. 



Species I. 

 Two-spined Shrimp. — Plate Y. 

 Cheraphilus bispinosus (Westwood Sp.) 



Pontophilus bispinosus. "Westwood, Hailst, Mag. ISTat. Hist., viii., p. 11^ 

 13, f. 30. 



Crangon bispinosus. Bell, Brit. Crust., p. 268 ; A. White, Pop. Hist. 

 Brit. Crust., 111. Kin. Trans. B. I. A. vol. xxiv. p. 66. 



Rostrum (r), short, rounded at apex, somewhat narrowed, hollowed above; 

 ocular notch broad, ciliated on outer edge only ; carapace rounded above ; 

 median gastric region bidentate, the teeth connected by an obsoletely -notched 

 carina ; lateral gastric and branchial regions furnished with rows of small 

 knobs; fifth and sixth abdominal somites bicarinated ; telson elongate, 

 hollowed above', second pair of chelipeds (11) half length of third. 



9, External maxilliped, terminal articulations; 10, Pirst cheliped, 

 with enlarged view of hairs on carpus. Figure four times size of life. 



Distribution. — Great Britain, South coast, Hastings. Ireland, East 

 Coast, Dublin ; "West Coast, Isles of Arran, Galway. 



Species II. 



Three-spined Shrimp. — Plate YI. 



Cheraphilus trispinosus (Hailstone Sp.) 



Pontophilus trispinosus. Hails., Mag. JVTat. Hist,, viii. p. 261, fig 25. 

 Crangon trispinosus. Bell, Brit. Crust., 265 ; A. White, Brit. Pop. 



Crust, 110; Kin. Proceed, i^at. Hist. Soc. Dub., vol. ii. Trans. E. I. A. 



vol. xxiv. p. 69. 



Rostrum (r) very short, moderately broad., rounded at the apex, hollowed 

 above ; ocular notch broad^ shallow, sparingly ciliated at its base ; carapace 

 rounded above, armed with one median and two lateral gastric teeth, ivhich 

 are continuous with an obsolete raised ridge ; branchial regions smooth ; 

 sixth abdominal somite obsoletely carinated ; telson hollowed ; remaining 



