MARINE INVERTEBRATE FAUNA OF PLYMOUTH. 337 



of them 5*5 mm., the other 9"5 mm. in length. This rare species 

 furnishes another valuable addition to our fauna. 



Perhaps the most interesting addition of all, however, has been the 

 rediscovery of D'Orbigny's Stiliger hellula, the Calliopa3a hellula of 

 that author's beautiful memoir on new species and genera of Nudi- 

 branchs observed on the coast of France. Ten individuals were 

 dredged in Cawsand Bay on the 3rd of August, but I have hardly 

 a remark to add to the admirable description of the external form, 

 colour, and habits of the species which the talented French naturalist 

 gave sixty years ago. The bearings of the anatomy of this primitive 

 form upon the epipodial theory of the cerata must be important, 

 since it occupies a position intermediate between Hermaea and the 

 Solids, which have been shown by Prof. Herdman to possess a 

 ceratal innervation constructed upon two distinct types. 



Among Cephalopoda, Eledone cirrhosa and Sepiola atlantica are 

 plentiful ; Rossia macrosoma has been taken twice this autumn. The 

 smallness and unseaworthiness of our present steamboat unfortu- 

 nately prevent us from visiting the proper localities for the larger 

 species of cuttle-fish, and we are therefore unable to obtain good 

 specimens of forms like Loligo Forbesii except on rare occasions. 



Crustacea. — An Amphipod, which Dr. Norman has kindly iden- 

 tified for me as TJnciola crenatipalma, Bate (sp.), is plentiful among 

 shells and stones on a muddy bottom at a depth of twenty fathoms. 

 The two sexes were described by Spence Bate under the names 

 Dry ope crenatipalma ( ? ) and D. irrorata { S ), and wrongly removed 

 by him from the genus Unciola, to which Gosse had rightly referred 

 the latter " species,^' owing to his inability to discover the secondary 

 appendage of the first antennae. A minute one-jointed appendage, 

 however, is constantly present, as Stebbing has already stated. The 

 species is readily recognised, when alive, by its form and colour, the 

 latter being yellowish, much speckled with white. It appears to be 

 very locally distributed, for it is not included in Mr. David Robert- 

 son's recent catalogue, in Mr. A. 0. Walker's lists of the L. M. B. C. 

 Amphipoda, or in Cams' s Prodromus Faunee Mediterraneae. 



Gorophium grossipes [longicorne] and G. crassicorne {Bonellii) in- 

 habit their special localities in thousands. 



Among Isopoda, Apseudes talpa has been taken in some numbers, 

 while species of Anceus, Munna, and Jaera are abundant. On June 

 19tli I found a male Anthura gracilis, 4 mm. long, provided with an 

 antennal flagellum of nine joints, each of which was encircled by 

 a dense ring of long slender hairs. Another specimen, dredged on 

 September 16th, was 5 mm. long ; the anteunse were as long as the 

 head and first two segments of the pereion, and each of the twelve 

 joints of the flagella was encircled with hairs, as in the preceding 



