COE: NEMEKTEANS OF WEST AND NORTHWEST COASTS. 125 



the lateral sense organs are conspicuous in preserved specimens as a 

 clear, oval area on each lateral margin of body in the midst of the 

 dark band. 



Meproductive organs. — Sexually mature in August and Septem- 

 ber. Sexual glands, as in other species of gemis, closely ])acked 

 together on dorsal side of body, but encroaching on the other tissues 

 when fiilly mature so as to fill up most of the space within the body 

 walls. Ova slightly cream colored. 



Habitat. — Living in delicate, ])archment-like, translucent tubes 

 on piles of wharf, under stones and in sand, Monterey, San Pedro, 

 and San Diego, Cal. The species is widely distributed as to situ- 

 ation, but was not found abundantly in any locality. It has pre- 

 viously been recorded from the Atlantic coast of the United States 

 (Coe, '95 ''), and is not uncommon near New Haven, Conn., and 

 Woods Hole, Mass., at low Avater. It is also common among dead 

 shells in 3 to 5 fms. in Vineyard Sound, Mass. 



This form resembles C. linearis in many respects, but lacks the 

 reddish coloring posteriorly and differs in many anatomical features, 

 most conspicuously in the absence of the broad band of longitiidinal 

 muscles so massively developed in C. linearis (cf. Burger, '95, PI. 

 XIII, fig. 21) between proboscis sheath and alimentary canal in 

 posterior nephridial region. 



Carinomella, gen. nov. 



Body rather slender, rounded anteriorly, flattened in the intestinal 

 region. Head changeable in shape, often wider tlian parts immedi- 

 ately following; pointed, rounded or emarginate in front, according to 

 state of contraction. Proboscis pore ventral, near tip of snout ; 

 mouth immediately behind brain. 



Cephalic furrows represented only by a pair of very inconspicuous 

 transverse grooves just back of head. Cerebral sense organs want- 

 ing, but a pair of large and very highly developed lateral sense 

 organs lies in the vicinity of the nephridial openings, as in Cari- 

 NELLA. Ocelli wanting. 



Intestine without regularly paired, lateral diverticula, although the 

 epithelium is thrown into conspicuous folds which often simulate 

 actual diverticula. 



Body musculature consists of a strong longitudinal layer and two 



