COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 127 



the genera Carinella and Carixoma are much more closely related 

 than Burger considers probable. I now believe that Bergendal 

 -was fully justified in restoring Hubrecht's order Paleoneraertea to 

 include the families Carinellidae, Hubrechtidae, Carinomidae and 

 Cephalothricidae. Miss Thompson also agrees with him (:02, p. 

 732) in this classification. The present genus evidently belongs 

 to the family Carinellidae, and shows a striking similarity to 

 Carinella linearis Mcintosh in many peculiarities of structure. 

 The position of the lateral nerves in the midst of the longitudinal 

 muscles behind the nei:)hridial region only is a wide departure 

 from any described genus. In this character the new genus sug- 

 gests a close relationship with Carinoma, as vnW be described 

 below. The massive development of the inner circular muscle and 

 its practical disappearance in exactly the same region as in Cari- 

 NOniA represent the conditions found in that genus, although an 

 approach to this condition is also found in certain species of 

 Carixella, notably (J. linearis. 



The massive band of longitudinal muscles between the proboscis 

 sheath and the intestinal canal, most highly developed posterior to 

 the nephridial region ; the position of the lateral blood spaces inter- 

 nal to the inner circular muscles in the anterior esophageal region ; 

 the pouch-like outfoldings of the intestine, which are not true div- 

 erticula, however ; the structure of the proboscis ; the enormous 

 cephalic blood lacunae ; the extremely thin basement membrane ; 

 the total absence of cerebral sense organs ; the anastomosing fibers 

 of the integument ; these may be enumerated as some of the more 

 striking peculiarities of the present genus. 



With Bergendal's genus Callinera (:00) there are many simi- 

 larities, but the differences are even more pronounced than is the 

 case with Cari]s^ella. 



8. Carinomella" lactea, sp. nov. 



PI. 5, figs. 45-49 ; PI. 6, figs. 50-54 ; PI. 7, figs. 55, 56 ; PI. 8, 

 figs. 57, 58 ; PI. 9, figs. 59-61 ; PI. 10, figs. 63-65. PI. 11, 



figs. 66-62. 



Body of rather small size, slender ; rounded anteriorly, flattened 

 in intestinal region. Head broad, variable in shape ; pointed, 



