OPHIOCOMA PUMILA. 



73 



a liglit-hrowii pattern ; iiiulcr ann-spincs nearly white ; upper spines 

 pale brown at their base, lighter at the point. 



Variations. — A specimen with a disk 15°""' had arms VO-"™- ; uniform 

 vandyke-brown above, and same l)elow, but paler, with a lew spots and 

 bands near end of arms ;ind on under arm-plates ; mouth-shields a little 

 broader than loni;-, and nearly circular ; granuhition of disk in inter- 

 brachial spaces below reaching nearly to genital slits on either side ; 

 two or three of side mouth-papilla) soldered together, making one broad 

 one ; only three rows of tooth-papilla) ; tive joints each with two 

 tentacle-scales, rest with only one. A specimen with a disk of IG"""- 

 had arms of Ho"""", which shows a range of length, in grown specimens, 

 of from five to seven times. Li'itken tj-ives the lenjjcth as over eiirht 

 times the diameter of the disk, — Young, said to be this species (origi- 

 nal O.jmmila Ltk.) : diameter of disk, 2.5"™-; length of arms, 12.5"""-; 

 disk covered with fine scales, over which are scattered a few grains, or 

 rather short spines. Upper arm-plates long heart-shaped, i. e. bounded 

 without by a strong curve, and on sides by two straight lines, meeting 

 within. Side arm-plates meeting above and below. Under arm-})lates 

 longer than broad, outer side curved, laterals re-enteringly curved, inner 

 laterals straight, and meeting within. One tentacle-scale. Only two 

 tooth-papilhw Mouth-shields heart-shaped, longer than broad. Arm- 

 spines four, at ])ase of arm ; rather more slender than in adult, and a 

 little rough. Color, in alcohol : pale yellowish-brown above, arms 

 barred with whitish, and six in number. 



This species is distinguished from the more common t3'pe of OjjJiio- 

 coma, by its long flattened arms, and less robust structure. 



LIST OF SPECIMENS. 



Catalogue Original Number 

 Number. Number, of Spec. 



Locality. 



When 

 Collecled. 



Whence obtained. 



Nature of 

 Specimen. 



291 

 2!)2 

 293 

 29i 

 295 

 29(j 

 297 

 298 

 299 



1050 

 1001 

 11(53 

 1075 

 1102 



3fuseum of Compai'ative Zoology. 



Florida. 

 Tortuj^as, Fla. 

 Tortujias, Fla. 

 Kt'v Wt'st, Fla. 

 Cape Florida. 

 St. Thomas, W. I. 

 jL'remic, Ilayti. 

 West Indies. 

 West Indies. 



Apr. 22, '58. 

 Mar. 19, '58. 

 Jan. 28, '58. 



Smithsonian Institution. 



Florida. 



St. Thomas, W. I. 

 St. Thomas, ^V. I. 

 St. Thomas, ^V. I. 

 St. Tliomas, W. I. 



10 



Prof. A^rassiz. 



J. E. Mills. 



J. E. Mills. 



J. E. ]Mills. 



Vt. Wurdeman. 



A. II. Iliise. 



Dr. 1). F. Weinland. 



I'niv.Miis.C(ip"lia<ren. 



Uuiv.Miis.Cop'hagen. 



Alcoholic. 



Alcoholic 



