88 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [382] 
alive on the bottoms of vessels, and-especially such as have recently 
arrived from the West Indies and other foreign countries. These 
resemble, in general appearance, L. fascicularis, (Plate VII, fig. 33,) 
which is acommon indigenous species, usually found adhering to floating 
sea-weeds and other small objects in early summer, in large numbers. 
It is doubtful whether any of those found on the bottoms of vessels 
can be regarded as true natives of this region. The most common of 
them is LZ. anatifera; the valves of its shell are bordered with orange. 
The other common species are L. anserifera and L. pectinata. Species 
of the curious genus, Conchoderma, also occur on the bottoms of vessels. 
Among the Crustacea that commonly occur among the ascidians, 
hydroids, and alge on the piles of wharves, are Panopeus Sayi, (p. 312,) 
P. depressus, (p. 312, Plate I, fig. 3,) Gammarus ornatus, (p. 314, Plate IV, 
fig. 15,) Amphithoé compta 8., (p. 370,) Corophinm cylindricum, (p. 370,) 
Melita nitida, (p. 314,) Caprella, sp., (p. 316,) and various small Entomos- 
traca. Jeera copiosa (p. 315) often occurs abundantly near high-water 
mark, on old piles and timber, living in the crevices. and craeks, or 
under loosened bark. 
Of Annelids very few if any species occur that are peculiar to these sit- 
uations. The Potamilla oculifera (p. 322, Plate XVII, fig. 86) is quite 
common on the piles of wharves where the water is pure. P. microph- 
thalma Y. (p. 323) also occurs under the same circumstances, and also on 
the piles in harbors, where the water is brackish. 
The Leprea rubra V. was found living in tubes among the ascidians. 
on the piles of the wharves. This is a Terebelloid worm, somewhat 
resembling the Amphitrite ornata, (Plate XVI, fig. 82,) but is much 
smaller, and there are fascicles of sete on all the segments. ‘There are 
three pairs of arborescently divided branchize, which are peduneculated, 
the last pair being quite small. The body is bright red, the tentacles. 
pale flesh-color. 
The Nicolea simplex V. (p. 521,) was also found with the last in large 
numbers, but mostly of small size. Both males and females of Nereis lim- 
bata (p. 318, Plate XI, fig.51, male) were often found among the barnacles 
and ascidians on the piles of the wharves at Wood’s Hole, but the males 
were the most abundant, while the reverse was the case with those dug 
out of the sand and gravel on the shores. 
Numerous other Annelids were occasionally met with among the ascid- 
ians and alge. Among these were Polycirrus eximius, (p. 320, Plate 
XVI, fig. 85;) Podarke obscura V., (p. 319, Plate XII, fig. 61;) a Phyl- 
lodoce, &c. ‘Two Nemerteans were also common; one of these was an 
olive-green species, with a light dorsal stripe, belonging probably to the 
genus Cerebratulus, but it was not carefully studied ; the second was 
Polinia glutinosa, (p. 324, Plate XIX, fig 97.) 
Of Gastropod mollusks quite a number of species occur on the piles 
of wharves, and some of them in great abundance, especially the smaller 
kinds which live among the hydroids and confervee. The most abun- 
