28 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



Tho cirri in tho individual figured and another of the same lot are 

 extremely slender and long, as in typical V. alba. Cirrus i of 10 and 

 21 joints, the shorter ramus about one-third as long as the longer. 

 Cirrus ii is similar, with 8 and 18, or 9 and 21, joints. In cirrus iii 

 the shorter ramus is over tlu'ee-fourtlis as long as the longer, thus 

 approaching the condition of the posterior cirri. Terminal appendage 

 has 22 long joints, is about three times the length of the protopod, 

 and from over one-half to nearly two-thirds as long as cirrus vi. 

 The penis is nearly twice as long as the protopod, being 1.2 to 1.7 

 mm. long. The mandible (fig. 7h) has three teeth, and seven or 

 eight points on the lower angle, the upper tooth being very large 

 and widely separated from the second. The maxilla (fig. 7a) has, 

 below the upper great spines, a deep recess m which a group of short 

 spines stands. The projecting lower edge has large and small spines 

 mingled. 



VERRUCA ALBA CARIBBEA, new subspecies. 

 Plate 2, fig. 4. 



Type. — Museum of Comparative Zoology. 



Type-locality. — Off Grenada, West Indies, in 92 fathoms, on a spine 

 of Dorocidaris ajjinis (Philippi), L'Za^e expedition. Also off Guada- 

 lupe in 150 fathoms, on spine of D. affinis, Blake expedition. 



Twenty-tlu-ee individuals on one spine of Dorocidaris are, with the 

 exception of a few yomig specimens, of nearly miiform size. In 

 sixteen of the lot the right scutum and tergum are movable. Some- 

 times the first articular ridge of the scutum is very weak and there is 

 variation in the articulation of the carina and rostrum. As a rule 

 each has tlu^ec ribs and teeth. In a few examples the second rib and 

 tooth of the carina are much broader than in othei"s. The upper rib 

 of the carina is always quite naiTOW, and the short ribs terminating 

 on the tergal margin are either extremely small, never more than two 

 m number, or, in a majority of the specimens, they are absent or barely 

 perceptible. The basal edge of the waU is as obtuse as in the type 

 form in some examples, thinner in others. 



Greatest carinorostral length 4.1, height of fixed tergum 2 mm. 



Cirri are as in typical V. alba. The teeth of the mandible are 

 more slender. 



Three individuals from off Guadalupe in 150 fathoms, Blalce col- 

 lection, are similar, but larger, tho largest 4.8 mm. long. 



VERRUCA ALEA BARBADENSIS, new subspecies. 

 Plate 2, figs. .''., on. 



Type. — ^Museum of Comparative Zoology. 



Type-locality. — Off Barbados in 106 fathoms, on tho spine of Doro- 

 cidaris bartletti A. Agassiz, BlaJce expedition. 



The shnpo is more depressed than T^. alba. The tergal area of the 

 movable scutum is narrower, its ribs three or four in number are 



