226 Bulletin American Museum of Natural History. [Vol. XXXIi, 



collection there is one individual 58 mm. long. In large specimens, the 

 unpaired ambulacrum is not so extraordinarily broad, but the short posterior 

 petals will always distinguish this species from townsendi. 



Station 5683. Off Cape St. Lucas, Lower California, 630 fms. Bottom 

 Temp., 39.1. 



Station 5685. Southwest from Ballenas Bay, west coast of Lower 

 California, 645 fms. 



Station 5694. Southwest of Santa Cruz Island, California, 640 fms. 



Six specimens. 



Brissopsis columbaris. 



A. Agassiz, 1898. Bull. M. C. Z.. Vol. 32, p. 82. 



The specimens are small, less than 35 mm. long, and one is broken in 

 fragments. Their occurrence off Cape St. Lucas, while not at all unexpected, 

 extends the known range considerably to the north. 



Station 5682. Off Cape St. Lucas, Lower California, 491 fms. Bottom 

 Temp., 40.8. 



Two specimens. 



Brissopsis pacifica. 



Toxobrissiis pacificus A. AGASSI/.,. 1898. Bull. M. C. Z., Vol. 32, p. 83. 

 Brissopsis (Toxobrissiis) pacifica MORTENSEN, 1907. "Ingolf" Ech., Pt. 2, 

 p. 44. 



Although this species was abundant at Station 5675, it was not found 

 elsewhere. The specimens range from 11 to 34 mm. in length, none of 

 them being full grown. Some are remarkably flattened, the abactinal 

 surface being more or less concave rather than convex; one such specimen 

 is 26 mm. long, 24 mm. wide, 8 mm. thick at margin and 6 mm. thick at 

 center of abactinal system. The cause of such a deformity is not easy 

 to imagine. The species was previously known only from Panama. 



Station 5675. Southwest of San Cristobal Bay, west coast of Lower 

 California, 284 fms. Bottom Temp., 44.6. 



One hundred and seventy specimens. 



Lovenia cordiformis. 



A. Agassiz, 1872. Bull. M. C. Z., Vol. 3, p. 57. 



A single small specimen, only 20 mm. long, from Cape St. Lucas, is the 

 sole representative of this species in the collection. 



