434 bulletin: museum of comparative zoology. 



Ophiacantha sentosa. 



Lyman, 1878. Bull. M. C. Z., 5, p. 140. 1882. Challenger Oph., pi. 13, 

 fig. 10-12. 



The Albatross specimens are not quite so large as those taken by 

 the Challenger, but they do not exhibit any noteworthy differences. 

 The depth at which the species lives is notable. 



Station 4658. West of Peru, 8° 30' S., 85° 36' W., 2370 fms. 

 Bott. temp. 35.3°. Fne. gn. m., mang. nod. 



Station 4666. West of Peru, 11° 55' S., 84° 20' W., 2600 fms. 

 Bott. temp. 34.9°. Fne. gy. rad. oz. 



Station 4672. Southwest of Palominos Light House, Peru, 88 

 miles. 2845 fms. Bott. temp. 35.2°. Fne. dk. br. infus. m. 



Bathymetrical range, 2370-2845 fms. Extremes of temperature, 

 35.3°-34.9°. 



Three specimens. 



Ophiacantha valenciennesi. 



Lyman, 1879. Bull. M. C. Z., 6, p. 57. 1882. Challenger Ech., pi. 26, fig. 



7, 8. 



The specimens of this well-marked, nearly cosmopolitan species 

 are notable for the de^'elopment of the spinules on the upper arm- 

 plates. They may occur out as far as the twentieth segment or a 

 little beyond and there may be 5 or 6 on the dist-al margin of each 

 plate. On the basal segments, there are pointed granules, rather than 

 spinules. 



Station 4642. Galapagos Islands: Hood Island, 4 miles south- 

 east of Ripple Point. 300 fms. Bott. temp. 48.6°. Brk. sh., glob. 



Four specimens. 



Ophiotoma paucispina. 



Ophiacantha paucispina Liitken and Mortensen, 1899. Mem. M. C. Z., 23, 



p. 175, pi. 18, fig. 1^. 

 Ophiotoma paucispina H. L. Clark, 1915. Mem. M. C. Z., 25, p. 218. 



The specimens are in poor condition and throw little light on the 

 character of the species or on its relationship to the other members of 

 the genus. 



