AMPHIPODA OF SOUTHERN NEW ENGLAND. 527 



but much shorter in adult male: second gnathopods in female attached in front of middle of segment; 

 hand oval; palm defined above by a spine-bearing projection and bearing a tooth near the lower end; 

 second gnathopods in the male longer than in the female; basal joint relatively narrower and armed, as 

 in the female, with an acute triangular projection at lower end; hand elongated; palm defined above 

 with a spine-bearing projection; a tooth below the middle separated by a rounded sinus from a trian- 

 gular projection below: posterior peraeopods rather stout, propodi narrow, palm about two-thirds as 

 long as posterior margin and defined above by a projection bearing a pair of spines; penes medium, first 

 two thoracic segments in adult males becoming much elongated, equaling in length the succeeding 

 segments of the body. 



Length, 16 mm. 



European coast to France; Greenland and Labrador (Ortmann); Casco Bay, Me., and Portsmouth, 

 N. H. C Mayer); Grand Manan; off Head Harbor to Salem, Mass.; Annisquam, Mass.; off Montauk 

 Point. 



Caprella septentrionalis Kroyer. 



Body moderately stout, smooth above except for a few low tubercles on posterior segments; head 

 with a dorsal prominence but no spine; eyes small, round; first antenna about half the length of body 

 in the male, a little shorter in the female; tirst joint of peduncle slightly longer than third but much 

 shorter than first; flagellum shorter than peduncle; second antenna; shorter than first; second gnatho 

 pods rather short and stout, basal joint much shorter than in linearis; hand in the female oval, a 

 spine-bearing process at upper end.of palm, a small tooth near distal end of palm, hand in the male 

 longer and narrower than in the female, with teeth similarly placed but with a larger triangular 

 prominence at lower end of palm. 



Length, 25 mm. 



Arctic regions; northern parts of the European coast; Greenland (Kroyer); Labrador (Smith, 

 Packard); Eastport, Me. 



The New England repre>eiitatives of thi- species are stout and have the tirst segments of the thorax 

 shorter than the form figured in Sars's Crustacea of Norway, and more nearly approaching some of 

 the several varieties of this species described by Mayer. 



Caprella stimpsoni Bate. 



Body robust, armed with numerous large, thick spines; head with a large, often bifid, spine or 

 tubercle above; tirst thoracic segment scarcely longer than deep, somewhat concave above, with a 

 pair of spines in front of and a single spine behind the depression; usually a large spine near middle 

 of second, third, and fourth thoracic segments, and a spine at either end, with smaller spines or tuber- 

 cles between; second gnathopods with hand and often merus studded with small tubercles. 



Norway; Grand Manan (Stimpson); Eastport, Me. Mayer also has examined specimens from the 

 latter locality, which were sent to him 1 ly Pre ifessor Packard under the name of Caprella robusta Stimpson. 

 Some of the specimens I have examined from Eastport were collected by Packard and similarly named 

 by him. All gradations occur between strongly spinous specimens and forms in which the spines are 

 reduced to low tubercles. 



The following names may be regarded as synonyms of this variety: 



Caprella robusta Stimpson (nomen preoc). 



( 'aprella punctata Boeck. 



Caprella septentrionalis forma 8, polyeerus Mayer. 



