708 FROCEEDINQS OF THE NATIONAL MUSEUM. vol.xxxii. 



wheels (Plate LXXV^III, fig. It), the majority of which are from 0.04 to 

 0.008 mm. in diameter. The spokes are so short that, as in the ven- 

 tral wheels, the interspaces appear sometimes as mere perforations. 

 These Avheels are essentially exactly like those of ventral perisome. 

 The large w^heels (fig. 1) var}' from 0.148 to 0.27 mm. in diameter, and 

 there are relatively few, intermediate in size with the small ones. The 

 spokes are short and the large nave is centrally pierced bv six sym- 

 metrical holes, forming a nave within a nave. A side view (fig. 1^/) 

 will give an idea of the form of the wheels. Nearly always there are 

 twelve spokes. Wheels of pedicels are like those of ventral perisome, 

 but rods are large)" (fig. 1^^), commonly attaining a length of 0.45 to 

 0.55 mm., and are thornier; thorns, however, are all short. There 

 appear to be no X-shaped rods, and there are no rods in dorsal peri- 

 some, so far as discoverable. Walls of tentacles are strengthened by 

 rods and the crown is crowded with them. Here they are of greatly 

 diverse sizes and are never straight. 



This species agrees with L. euisns Sluiter in having two rows of 

 papilht' on each dorsal radius, but the papillae are short, not long as in 

 enis >(,-<, which further has 20 large pedicels to each ventrolateral radius 

 instead of 50 or more small ones. In respect to the pedicels hiserialis 

 approaches L. tlieell Ludwig. That form, however, has but one row of 

 eight to ten spaced papillae to each dorsal radius, not 64 in two series. 

 Further, it may be added that the deposits of hinerlalin difl'er from 

 those of the above two species, which are the only ones with which 

 the Hawaiian form is directly comparable. 



LiETMOGONE, species. 



There is a small specimen from Station 4043 (west coast of Hawaii, 

 236 to 233 fathoms, gray sand, broken shells, rocks), which has unfor- 

 tunately^ lost all the calcareous deposits. It is therefore futile to 

 attempt an accurate identification. Body rather long and slender; 

 mouth subventral, anus injured, proba])ly terminal. Tentacles 11, 

 large, with cii'cular crowns not greatly wider than the thick stalks. 

 Pedicels long and rather slender, upward of 60 in a zigzag series 

 along each ventrolateral radius; especially irregular on posterier por- 

 tion of body. Papillaj contracted, shorter than pedicels, about 20 to 

 25 in a single series along each dorsal ambulacrum. Body wall thin. 

 Color in life: Body translucent grayish or whitish, base of papillse 

 violet, tube feet transparent. 



Of course the number of tentacles is very small. This, taken with 

 the large number of pedicels and single row of dorsal papilhe, sepa- 

 rates the former from both enisus and theeli (20 tentacles). There 

 seems little doubt that the specimen is new. 



