274 bulletin: museum of comparative zoology. 



appendages from which the diverticula above described originate. 

 The intestine proper (mid gut) and its lateral diverticula are as in 

 related species. 



Nephridia are situated immediately behind the brain and are lim- 

 ited to a comparatively short distance in the esophageal region. A 

 single pair of efferent ducts opens on the ventro-lateral surfaces of 

 the body a short distance behind the brain. 



Cerebral sense organs unusually voluminous, situated beside brain 

 and extending back as large lobes posterior to dorsal ganglia. 



Reproductive organs. — Sexual products nearly mature in a speci- 

 men collected in August. Sexual glands situated beneath muscular 

 layers of body walls throughout nearly the whole circumference of 

 body, but opening on dorso-lateral surfaces of body almost without 

 exception. 



Habitat. — But two specimens of this species were contained in 

 the collections at hand. Both were dredged by the Albatross ; 

 the one from 40 fms. off Washington in 1888 (Sta. 2865, Lat. 48° 

 12' K, Long. 122° 49' W.) on pebbly bottom. The other was taken 

 three years later near the same locality (Sta. 3443, Lat. 48° 18' N., 

 Long. 123° 11' W.) in 97 fms., green mud and pebbles. 



Tliis species is apparently closely related to A. ruhellus from off 

 San Pedro, California, but presents several ])oints of difference, as 

 indicated (p. 276). Both species are remarkable in the possession of 

 a conspicuous esophageal caecum, but this peculiarity is shared mth 

 three other species of the genus, viz., A. bimacidatvs (p. 241 ) from 

 nearly the same region, A. marmoratus from Europe (.Toubin, '90, 

 p. 564), and A. arcticus from Davis Strait (Punnett, : 01, ]). 94). 

 Unfortunately the armature of the proboscis has been described in 

 but two of these five forms, so that their specific relationship remains 

 uncertain. 



As stated above, however, the peculiarities of the various portions 

 of the digestive tract, with esophageal and cardiac, as well as intesti- 

 nal caeca, are sufficiently marked to distinguish the present species 

 from any of these others. 



68. Amphiporus rubellus, sp. nov. 

 PI. 1, figs. 11, 12. 



Body short, thick and stout; in life often broader and thicker 



