MUSEUM OF COMPARATIVE ZOOLOGY. 83 
(mainly from muddy bottoms) were of a dull grayish color, or with a 
more or less yellowish pink tint. A pretty Sigsbeia attached to an 
Allopora varied from nearly porcelain-white individuals to specimens 
more or less belted with bands of ashy violet. 
The Pourtalesize with thin tests, like the other species of the family 
already known, were of a delicate pink color; those with stouter shells, 
of a dark violet or deep claret color. The same is true of Urechinus and 
of Cystechinus, in which the color varies from a light brownish pink to 
a pale claret tint. 
The species of Asthenosoma were of a deep claret-color, varying from 
that to light brown, almost straw-color. Some of the Phormosome, on 
the contrary, are usually of a brownish brick-color, others of a deep 
violet. In Paleopneustes we find the same variation in tints as in the 
Echinothuriz. 
The coloration of the deep-sea fishes is comparatively monotonous. 
The tints are all of a light violet base, tending more or less to brownish 
or brownish yellow, or even to a greenish tint, especially among the 
Macruridee. Some of the Liparidz were of a dark violet, and one species 
was characterized by a brilliant blue band. The Ophidiide, Nemich- 
thys, and the like, are usually of an ashy violet tint, while in Ipnops 
and Bathypterois the tints were of a decidedly yellowish brown. When 
we come to questionable deep-sea types, such as the Beryx-like fishes, 
we find some of them nearly black with a slight violet hue, resembling 
more in their coloring the prevailing body tints of Stomias and the 
like, and other fishes which occur within the 300 fathom line from the 
surface. Among the most strikingly colored fishes we obtained was a 
species of the Ceratias group, of a brilliant vermilion with yellowish blue 
patches on the sides, in striking contrast with its Atlantic congeners, 
which are usually of a blackish tint. 
The semi-transparent deep-sea types, like Aphyonus, are usually pink- 
ish, while the Scopelids and the like, which are pelagic fishes, the major- 
ity of which do not descend below 300 fathoms, have a dark, almost 
black coloration, in striking contrast with their silvery flanks, which often 
‘carry phosphorescent organs. In a species of Stomias there is on the 
sides a wide band, gradually tapering towards the tail, of a brilliant 
yellow. 
Among the Holothurians we noticed the greatest variety in the color- 
ing. In one species the color was of a delicate green tinge. Trochostoma 
does not differ greatly in coloration from its littoral allies). We obtained 
a white Cucumaria and some species of Benthodytes of the same color. 
