122 



A CORNISH FAUNA. 



Mr. W. P. Cocks took some specimens in the trawl refuse, at 

 Gyllyngvase, Falmouth, and some specimens are in the Hopeian 

 Collection at Oxford, and labelled "South-west Coast of England." 

 It has also been taken in Scotland. 



Idotea appexdictjlata. — Risso, Hist. Nat. de VEnt. Nereid, vol. v, 

 p. 107, 14,/. 29. 

 Not very common, it has been taken at Polperro. 



SPtf^EROMlDJE. 

 Genus, Sph^poma. — Latrielle. 



Animal capable of rolling itself into a ball. Head small. 

 Eyes dor sally placed at the posterior angles. Antennae short. 

 Body wider than head. Posterior portion of the body (pleon) 

 united into one segment. 



Sph^epoata seppatpm. — Fabricius, Mani. Inst., I, p. 242. — Bate and 

 Westwood, p. 405. 

 This species is common under stones and among pebbles on 

 all our coasts, from Kent to Cornwall, and in the Mediterranean. 

 We have also dredged fine specimens in Plymouth. Sound, and 

 observed quantities in brackish streams in South "Wales. 



Spileroma pugicaistdata. — Leach, Edin. Ency., vii, pp. 405-433. — 

 Bate and Westwood, p. 408. 

 Erom the Hebrides to the coast of France has this animal been 

 obtained. In Cornwall we have found it at the mouth of the 

 river Tamar. 



This is a very active species, swimming, as all of the genus do, 

 with its back downwards. 



Sph^eroma PRiDEAuxiAisrAM. — Leach, Diet. Sci. Nat., xii, p. 345. 

 — Bate and Westwood, p. 455. 

 "Dr. Leach obtained this unique specimen from Mr. C. 

 Prideaux, who took it on the west coast of Devonshire" (prob- 

 ably Plymouth Sound). 



Gexus, Dynamene. — Leacli. 



Resembles a male Sphseroma, but is distinguished from it by 

 a notch in the tail. 



