208 



HAWAIIAN AND OTHER PACIFIC ECHINI. 



well deserves the name grandis as does this magnificent spatangoid. The best 

 specimens in the M. C. Z. collection are about 215 mm. long, 165 mm. wide and 

 55 mm. high and the dorsal primary spines are 75-90 mm. in length. When in 

 perfect condition with all its long, dorsal primary spines intact, it is certainly 

 the handsomest and most remarkable of shallow-water spatangoids. It must 

 be fairly common at Nassau, Bahama Islands, as I have seen a number of speci- 

 mens taken "on a bank, outside the bar" at that port. It is also known from 

 Tampa, Florida, and Bahia, Brazil, but I have not found it at Jamaica or 

 Tobago and the Blake did not meet with it on any of her voyages. 



The pedicellariae of this species are very striking. In general they resemble 

 those of P. costae as figured by Mortensen but they are obviously different. 

 No ophicephalous or normal globiferous were found on the specimens examined. 

 The curious "long globiferous" occur abundantly in the posterior ventral 

 ambulacra, but they are not covered by dark colored tissue as they are in costae. 

 The valves are nearly a millimeter long (PI. 146, fig. 21) and do not meet at tip 

 as usual but overcross there (PL 146, fig. 22). Rostrate pedicellariae are very 

 common; while they resemble those of costae, the valves are shorter and have a 

 much wider base; each valve is about .75 mm. long, with the base about .35 

 mm. high and equally wide. Tridentate pedicellariae are rare, only one being 

 found. It had valves 1.25 mm. long, with narrow blades having very coarsely 

 dentate edges; they resemble those of Brissus unicolor (see Mortensen, 1913. 

 Mitt. Zool. Stat. Neapel, 21, pi. 4, figs. 19 and 27) more than they do those of 

 P. costae. Triphyllous pedicellariae are also hard to find and only one was seen. 

 It had valves about .25 mm. long and might perhaps better be considered a 

 small tridentate; but the form of the valves was similar to what is seen in P. 

 costae though the blade is markedly narrower. 



Plagiobrissus africanus. 



Plagionotus africanus Verrill, 1871. Trans. Conn. Acad., 1, p. 569. 



I have never seen a specimen of this species and have found little in the 

 original description by which to distinguish this West African species from 

 West Indian specimens of the same size. The typo locality is Sherboro Island. 



Sierra Leone. 



Plagiobrissus costae. 



Metalia costae Gasoo, 1X77 Etendie. Accad Sci Napoli, 15. fuo. 2, p. 4. 



'This species is as yet known only from the Gulf of Naples where it is far 

 from common. It has been well figured and the pedicellariae described in 



