NO. 1556. HAWAIIAN HOLOTIIURIANS— FISHER. 645 



The following is Theel's description: 



Tentacles 20 to 27. Ambulacral appendages in the shape of pedicels on the ven- 

 tral surface and papillae on the dorsal. Seldom an arrangement of pedicels in longi- 

 tudinal series visible. A single genital bundle present, situated on left side of dorsal 

 mesentery. Anus surrounded l)y five calcareous teeth. No C-shaped deposits in the 

 body wall. 



KEY TO HAWAIIAN SPECIES OF ACTIXOI'YUA. 



a. Among the deposits, tables. 



h. Tentacles 20; calcareous deposits crowded tables (the spire of which is truncate, 

 quadrate, armed with numerous teeth) and large, smooth l)uttons with six to 

 eight holes ordinarily, but exceptionally four or five and as high as thirteen. 



liarrula. 



hh. Tentacles 20; calcareous deposits thinly scattered tallies, tlie spire terminating 



in sixteen to twenty teeth, and hollow fenestrated elli{)soids forming a thick 



layer nohilis. 



cKi. Deposits chiefly rods; no tables. 



h. Tentacles 20; deposits finely granulated, simple rods ^..ohe»a. 



bb. Tentacles 25; deposits in dorsal integument rods, with small processes running 

 out at the sides and with ends spinous or dichotomous; in the ventral peri- 

 some small, suiooth, oval grains and larger, smooth, unbranched rods with 

 the ends slightly mugh mauritiana. 



ACTINOPYGA PARVULA fSelenka). 



Plate LXVII, figs. 2, 2a-;/. 



Mulleria parvula Selenka, Beitriige zur Anatomic u. Systematik der Holothurien, 

 Zeitschr. f. Wiss. Zool., XVII, 1867, p. 314, pi. xvii, figs. 17-18. 



Body elongate ovoid, robust, but much contracted. Tentacles 

 retracted, but mouth apparently somewhat ventral; anus terminal, 

 surrounded by live small calcareous teeth. Tentacles 20 to 21, peltate, 

 medium sized, rather crowded. Ventral surface well marked from 

 dorsal, covered with pedicels of conspicuous size which are not 

 arranged in definite order. Papillt\? of dorsum nuu'h less numerous, 

 without order, and contracted so that their size is not at once apparent. 

 They seem to be slightly smaller than the pedicels and are without 

 terminal plates. Integument thick, minuttdy roughened by the spires 

 of the densely crowded tables. Deposits : Very numerous tables and 

 buttons; the former with a central and about eight peripheral smaller 

 holes and a well-developed spire terminating in a sub(|uadrate crown 

 of numerous (a])out thirty-six) teeth; the latter large, smooth, })ierced 

 by six to eight irregular holes. Pedicels and papilhe with perfo- 

 rated supporting plates and rods. The color in alcohol is very dark 

 brown. Length of largest individual, nuicli contracted, 40 mm,, 

 width, 28 mm, 



LoccdltleH. — Napili, Maui (2); Necker Island ? ((J); Honolulu, reef 

 (2); Laysan, reef (3). 



Although the specimens are badly contracted it is evident that the 

 crown of tentacles is surrounded by a collin*, jxM-haps not so pi'orainent 



