. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHARACTERISTIC DEEP-SEA TYPES. LAMELLIBRANCH8. 73 and largest of its genus, white, with a golden epidermis, is pecu- liar in its shape, which resembles that of a small member of the VeneridaB. A delicately sculptured Cardium, sometimes painted with bright touches of yellow and scarlet, Cardium perama- bilis (Fig. 304), the most lovely species of the genus from deep water, shares with the little Pecten (Amusium) Pourtalesianum Dall the distinction of bright tints where pallor is the rule. The shell is white, b
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHARACTERISTIC DEEP-SEA TYPES. LAMELLIBRANCH8. 73 and largest of its genus, white, with a golden epidermis, is pecu- liar in its shape, which resembles that of a small member of the VeneridaB. A delicately sculptured Cardium, sometimes painted with bright touches of yellow and scarlet, Cardium perama- bilis (Fig. 304), the most lovely species of the genus from deep water, shares with the little Pecten (Amusium) Pourtalesianum Dall the distinction of bright tints where pallor is the rule. The shell is white, but the spines covering it are orange or crimson. A common and characteristic deep-water form is Limopsis aurita Brocchi, well known as a tertiary fossil in Europe. A small brown Astarte is almost ubi- quitous, ranging in depth from 13 to over 1,000 fathoms, and in locality from the tropics to New England. The northern specimens attain many times the size of those from the Antilles. A highly polished rich golden brown Modiola, M. polita V. & S. (Fig. 305), allied to our com- mon mussel, attains a large size in great depths on both sides of the Atlantic. But its shell is very thin : it spins a laroe nest of byssal threads, it , to i f i li Fig. ;). — Modiola resembling a handful oi cotton waste thoroughly pouta. f. drenched with the finest mud, so worthless in appearance that only a biologist would suspect the treasure hidden within. The Cetoconcha above mentioned are characterized by gills reduced to a mere interrupted line of low lamellae on the ven- tral surface; they are related to Poromya, which has ordinary gills. But there is another group, abundant in deep water, called Cuspidaria, still more remarkable in having ap- Fig. 306.—Cuspidaria microrhina. 1. n l • parently no gills at all; th en- shells are provided with a long slender rostrum, like a handle, as shown in C. microrhina Dall (Figs. 306, 307), dredged from continental depths. A striking group, fr
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