294 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



towards gray and on the other towards black. As a rule specimens from 

 any one locality are much alike in color though large specimens may be 

 darker than small ones. There is never any white nor any hint of green, 

 but suggestions of a red violet are sometimes evident, and very young speci- 

 mens (under 15 mm h. d.) may have a very definite red orange or a dull 

 yellow tint around the peristome. 



Distribution. — ^According to Mortensen, this sea-urchin occurs as far 

 north as "off Central California," but the Velero has not found it north 

 of the Mexican boundary. Indeed she has not taken it anywhere on the 

 western side of Lower California, although she has found it at various 

 points in the Gulf as far north as Guaymas and Angel de la Guardia 

 Island. It is common on the Mexican and Costa Rican coasts and in 

 Panamic waters. Further south it has been taken by the Velero at various 

 points on the coasts of Colombia, Ecuador, and Peru as far south as the 

 Lobos de Afuera Islands. At the Galapagos Islands, it is quite common, 

 being taken at more than 20 stations though never in large numbers. Some 

 typical specimens were secured at Cocos Island and one good series was 

 collected at Braithwaite Bay on Socorro. A single young specimen was 

 collected at Clarion Island, but the Echinometras of Clarion Island need 

 further collecting and study. 



Type.— M.C.Z. no. 1851 (Cotype). 



Type locality, — Acapulco, Mexico. 



Depth. — Shore to 29 fms. 



Specimens examined. — 658 specimens from 92 stations. 



Order EXOGYCLpIDA 

 Family Glypeastridae 



Glypeaster europacificus H. L. Clark 

 Plate 46, Fig. 26 



Glypeaster europacificus H. L. Clark, 1914, p. 27, pis. 129, 130, 131, 136, 



fig. 1. 

 The 102 specimens of this fine Glypeaster taken by the Velero form a 

 very complete series from the babies 16x15 mm to the full grown adults 

 just exceeding 200 mm in length. The largest specimen is 202 mm long 

 by 200 mm wide and 30 mm high ; the test margin is about 6 mm thick. 

 In most specimens the width of the test is not so great proportionately, a 

 normal adult is 184 by 174 mm with the height 27 mm. The young are 

 nearly or quite circular and many individuals continue so throughout life. 

 Some, however, elongate appreciably; the longest of the present series 

 have the width nine-tenths of the length. As a rule the height is about 15 



