300 AMPllIPODA ABEKRANTIA. 



that of the male as here described ; and so ^adually can these 

 differences be traced, that there cannot be a doubt that they are 

 those of degree only. The species may invariably bo distinguished 

 from all otliers by the vaulted character of the skull-like cephalon, 

 and by the peculiarity of the dorsal tubercles (particularly those 

 most posteriorly situated) being surmounted by numerous small 

 bead-like tubercles. 



15. Caprella acanthifera. (Plate LVII. fig. 2.) B.M. 



Caprella acanthifera, Leach, Edinb. Ettci/cl. vii. p. 404 (not Johmtoti). 

 Caprella tuberculata, Guei-in, Icon. Crust, pi. 28. f. 1. 

 Goodsir, Edhib. New Phil. Journ, xxxiii, 



Male. — Cephalon not lobed, surmounted by a small tubercle. First 

 two segments of the pereion long; five posterior tuberculated, 

 the tubercles increasing in size posteriorly. Second pair of gnatho- 

 poda articulating at the posterior extremity of the second segment ; 

 propodos long, pubescent ; palm rather more than half the length 

 of the propodos, concave, defined by a stout process surmounted by 

 a sharp tooth ; dactylos armed with an obtuse protuberance near 

 the middle of the inner margin. Three posterior pairs of pereio- 

 poda short. 



Female. — Cephalon surmounted by a stout tooth. First segment 

 of the pereion short; second much longer, tuberculated; five 

 remaining segments tuberculated, the tubercles increasing in size 

 posteriorly. Second pair of gnathopoda articulating near the 

 anterior extremity of the second segment ; propodos ovate ; palm 

 straight, defined by a small tooth. 



Length : male ^ an inch, female \ of an inch. 



Hob. Guernsey (jRev. A. M. Norman); MiUport, IST. B. {Mr. 

 Robertson). 



The form of the propodos of the second pair of gnathopoda appears 

 occasionally to vary from that of the specimen described. 



16. Caprella sangmnea. 



CapreUa sanguinea, Gould, Inx^ert. Mass. p. 336. 

 Stimpson, 3Iarine hivert. Grand Manan, p. 44. 



" A very common species in the higher levels of the Laminarian 

 zone. It may be distinguished from the others by its slender an- 

 tennae and proportionately large hands. Colour bright crimson. 



" Length |- of an inch. 



" Hah. Grand Manan." — Stimpson. 



17. Caprella longimanus. 



Caprella longimanus, Stimpson, Marine Imert. Grand Manan, p. 44. 

 " Body with a few spines along the back of each segment. Superior 



