156 HAWAIIAN AND OTHER PACIFIC ECHINI. 



meter long, with margins coarsely serrate near middle but becoming finely 

 serrate distally. Ophicephalous pedicellariae are common but very small with 

 the valves only .07-. 15 mm. long, plus .05-. 10 mm. more for the loop; the blade 

 is noticeably long and narrow with numerous teeth or prickles on the thickened 

 margin. Triphyllous pedicellariae with very long necks are common; the 

 small leaf-shaped valves are scarcely .07 mm. long. Calcareous particles in the 

 pedicels, in the form of knobbed or rough rods are fairly common. 



The specimens from 3890 and 4044 are much smaller than those from 3838, 

 the length being about 15 mm. The test is relatively less flattened, the peripeta- 

 lous fasciole is less distinct (it can hardly be made out in the smallest specimen) 

 and the ventral ambulacra are not so bare. These differences are of interest 

 only as throwing light on the growth- changes. 



Station 3838. Off Lae-o Ka Laau Light, Molokai, Hawaiian Islands. 

 Bott. temp. 67°. 92-212 fms. Fne. gy. br. s. 



Station 3890. Off Mokapu Islet, Molokai, H. I. Bott, temp. 71.2°. 71- 

 283 fms. Bk. s. 



Station 4044. Off Kawaihae Light, west coast of Hawaii, H. I. Bott. 

 temp. 47°. 198-233 fms. Fne. gy. s. 



Bathymetrical range, 71-283 fms. Extremes of temperature, 71.2°— 47°. 



Five specimens. 



Homolampas. 



A. Agassiz, 1872. Rev. Ech., pt. 1, p. 137, 348. 

 Type, Lissonotus fragilis A. Agassiz, 1869. Bull. M. C. Z., 1, p. 273. 



This is a well-marked genus of large spatangoids. In the deeply sunken 

 scrobicules of the primary tubercles, it approaches Lovenia and the probability of 

 this relationship is strengthened by certain resemblances in the pedicellariae. 

 It is especially worthy of note that ophicephalous pedicellariae are wanting in both 

 genera. That these two genera are placed in separate Families is a striking 

 commentary on the system of classification used, one result of our very imperfect 

 knowledge of spatangoid development. The separation of the species of Homo- 

 lampas is very difficult. The peripetalous fasciole either tends to disappear 

 with age or else is subject to great individual diversity. There is not sufficient 

 materia] available to determine such points. After several vain attempts 

 to separate the Bomolampas from Indian Seas [glauca o\ Wood-Mason and 

 Alcock) from the Pacific species fiduq, I have decided to consider them identical. 

 The Panamk and West Indian species are very closely allied to/ufoa as well as 



