MARINE INVERTEBRATA OF GRAND MAN AN. 47 



Antennae strongly subpediform, curving downwards and very hairy ; the inferior 

 ones, which arise beneath the head and behind the eyes, being a little the longer. 

 Legs of the first pair small, with a small subcheliform hand ; those of the second • 

 pair long, with the basal article curved, and the hand of great size, bearing a long 

 spine or thumb below, and a large bi-articulate finger, the penultimate article of 

 Avhich is very thick, and seems rather part of the hand. The whole hand, when 

 closed, is of an elongated oval or suboblong form. The legs of the third and fourth 

 pairs are small, but with broad, flat, basal articles ; those of the fifth pair shortest of 

 all; those of the sixth and seventh slender, with sharp nails at their extremities. 

 Caudal stylets of the first two pairs with long peduncles ; those of the first pair 

 projecting a little beyond the others ; those of the last pair very short, simple, and 

 subuncinate at their extremities. Color on the back dark mottled gray ; epimei"a 

 blackish; terminal articles of the four antennas bright red; hands yellowish. 

 Female generally larger than the male ; superior antennae as long as the inferior 

 ones ; legs of the second pair not large, with a small, short, and broad hand, which 

 has a short uniarticulate finger, and a thumb cansisting of a sharp projection from 

 the base of the antepenultimate article. In other words, the penultimate article is 

 here expanded into a hand, instead of the antepenultimate as in the male, which 

 latter article, however, bears the thumb in both. The colors are the same as in the 

 male, except that the under side of the thorax is bright j'ellow, from the contained 

 eggs. The dimensions of a large female are as follows : length, 0.5 inch; of which 

 the proportions of other parts are : greatest breadth, at the 4th segment, .21 ; height 

 at 4th segment, .1 ; length of superior antennae, .42 ; the 1st pair of caudal stylets, 

 .15; of a leg of 2d pair, .35 ; of a leg of the longest (7th) pair, .36. The largest 

 male was 0.41 inch in length, the proportion of the breadth at 4th segment being 

 .2 ; of the length of the second pair of legs, .61. The figures represent views of 

 the posterior caudal stylets. This species was dredged abundantly on stems of 

 Boltenice in 20 £, rocks, off" Moose Inlet, towards the Seal Islands. It afterwards 

 occurred sparingly in 10 £, off Cheney's Head, and in 25 f., off Duck Island. 

 Specimens occurred on the tenth of August, with eggs, which were hatched on the 

 twenty-fifth of the same month. 



The Gerapus rubricornis inhabits flexible tubes, of sizes corresponding to that of 

 the individuals, composed of fine mud and some animal cement by which it is 

 agglutinated. These tubes are generally adherent for about one-half their length, 

 and closed below. They are usually found in large groups, attached to submarine 

 objects, and to each other. The animals are very active, protruding and retracting 

 the anterior portion of their bodies, while their antennae are in continual motion, 

 lashing about in search of some object which might serve for food. It is very amus- 

 ing to watch a colony of these animals, with their comical gestures in their disputes 

 with each other, and their aAvkward celerity in regaining their respective tubes 

 after having left them on temporary excursions. I have in no instance met with an 

 individual transporting a free tube, as is said by Mr. Say to be the case with his 

 C. tubularis. (Journ. Acad. Nat. Sci., i. 51; PI. iv.,f. 7-11.) There can be no doubt 

 that the tube is fabricated by the animal, and this is not without precedent in the 

 Crustacea, for I have often met with examples of Pagurus, which had enlarged their 



