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Show ENTOZOA. 360 . I also place an animal which ap· At the end of this order but which may one day serve proaches it in several respe~!;ms a genus which I have named as the type of a new one. It NEMERTEs, Cuv. d rm smooth, slender, flat· f d elongate wo , . d b It . an extremely so t an 'ty by a blunt point, plerce y lS d tone extreml . 'd d d tened and terminate a l. h it fastens to its prey, lS Wl ene an h le· the other end, by w uc th whole length of the body. A a o ' . traverses e f t' very op en · Its intesbtml e nnected w1. t h the process o genera 10hn, secon d canal ' prob. a Y co· tes and term1· nates in a tubercle on t e 1 · . serpen tines along lts parl· e Messrs d'Orbigny and de B amn1 1 e. , margm· of the w. ide opemng. that the wide aperture 1s 1 while alive, assure us who saw the amma its mouth. . • Borl., Cornw., XXVI, 12, is ~o:e th.an N. Borlassz, Cuv., . b . din the sand, and, 1t 1s satd, . 1 th It remams urle four feet m eng : hich it sucks in their shell( 1 ). attacks the Anoml<£ w In the v1. c1. n"l tY of N emertes should probably be placed the TunuLARIA, Renieri, d extremely elongate d ' but furnished with a small Equally lar?e an d the anterior extremity. mouth openmg un er 0PHIOCEPHALUS, Qu oy an d Gaym • . f the mouth cleft. With the same f o rm but the extremlty o CEREBRA TULA, Renieri. d. ffi • in the greater sh· ortness of the body(2). Which seems only to 1 er 1 1 am indebted hich is mentioned by Borlasse on y, f Oken; ){, (1) For this singular wor~, w It is the genus BonLASU. o '1 ho found lt near Brest. to M. Dumeri w . 1 alled it Lnous. h names of Tu· Sowerby had prev~ou& y c tl Tubu1aria nor Cerebratula. T e ot subsist. (2) We have nelther seen :le d lied to other genera, cann bulal·ia and Ophiocephalus, bemg alrea y app PAUENCHYMATA. 361 ORDER II. P ARENCHYMATA. The second order of the Entozoa comprises those species in which the body is filled with a cellular substance or even with a continuous parenchyma, the only alimentary organ it contains being ramified canals, which distribute nourishment to its different points, and which, ·in most of them, originate from suckers vis~ble externally. The ovaries are also enveloped in this parenchyma or that ce1lulosity. There is no abdominal cavity, nor intestine properly so called; the anus is wanting, and if we except some equivocal vestiges in the first , families, there is nothing to be found which bears a resemblance to nerves. We may divide this order into four families. FAMILY I. ACANTHOCEPHALA. The Parenchymata of this family attach themselves to the int~stines by a prominence armed with r~curved spines, whtch also appears to act as a proboscis. They form the single genus EcHINORHYNCHus, Gm. Where the body is round, sometimes elongated, and sometimes in the form of a sac, provided anteriorly with a prominence in the VoL. IV.-2 V |