Report on the Invertebrata of Massachusetts, comprising the Mollusca, Crustacea, Annelida, and Radiata . rocured by him from the gills of the alevvife, (Jlldsavulgaris,) I find to be new. As I have not since been able toobtain specimens, I cannot give a detailed description; but thefollowing characters will serve to distinguish it from other knownspecies. The shield is obovate or obcordate, covering only the first twopairs of legs, which are so long that the fringedfingers project entirely beyond it. Abdo-men bearing the next three pairs of legs,very narrow, and half as long as the
Report on the Invertebrata of Massachusetts, comprising the Mollusca, Crustacea, Annelida, and Radiata . rocured by him from the gills of the alevvife, (Jlldsavulgaris,) I find to be new. As I have not since been able toobtain specimens, I cannot give a detailed description; but thefollowing characters will serve to distinguish it from other knownspecies. The shield is obovate or obcordate, covering only the first twopairs of legs, which are so long that the fringedfingers project entirely beyond it. Abdo-men bearing the next three pairs of legs,very narrow, and half as long as the follow two short folia, covered by twoothers, each of them nearly as long and asbroad as the exposed part of the abdomen. It differs from A. foliaceus in having theshield broader behind than before ; by itsextended abdomen, the shield in that speciescovering all but the last pair of legs ; and bythe much greater length of the caudal appen-dages. In A. Catastomi, the legs scarcely extend beyond themargin of the shield, which is nearly circular, and rather broaderthan long. Length about half an CaLIGUS PISCINUS, Latk. ; Hist. J\at. des Crust., iv. pi. 31, f. Monoculus piscinus, Lin.; Faer. This little fish-louse may be found, at almost any time, upon thesurface of the cod and other deep-water fishes, especially if thefish is unhealthy. It has a small, rounded disc, about a fourth ofan inch in diameter, having two flattened, jointed appendages be-hind, which are sometimes an inch in length, though they areseldom found entire. I have another species of Caligus, quite different from the pre-ceding, taken from a shark [Lamna punctata). It is remarkablefor having, within each posterior angle of the shield, two littleelevated crests, placed at right angles to each other. The abdom-inal and caudal plates are very long and broad, and beyond thesethe jointed appendages project, making the whole animal an inch pfficiLopODA. CRUSTACEA. cecrops. 341 and a half in length. The
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Keywords: ., bookauthormassachusettszoologic, bookcentury1800, bookdecade1840
