ENTEROBRYUS. 



[ 285 ] 



E^'TOMOSTRACA. 



■v^itli red eye-spots behind the head; spicule 

 single. 



P. luicans. Eye-spots contiguous; cirrhi 

 t-v\-o. In the intestine of the larva of a 

 neuroptercHis insect. 



P. harbi(jer. Cirrhi four; red spots se- 

 parate. In stagnant -water. 



EnchUid'htm. Filiform, a single red eye- 

 spot, as broad as the body, situate at some 

 distance fi-om the head. Marine. 



See Anguilltjlid.^. 



BiBL. Dujardiu, Helminth. pQ\ Jim A- 

 niaun, Lamarck's Anim. sans Vert. iii. 5G4 ; 

 Bastian, Linn. Tr. xxv. 73. 



EXTEROBRY'US, Leidy.— A supposed 

 genus of Kiitzing's Leptomiteae, probably 

 the mycelium of some fungus, found in the 

 intestines of insects. 



Eccei'na, Leidy, is another of these 

 forms. 



BrBL. Leidy, Proc. y. H. Soc. Philadel. 

 1849, 225, Ann. N. H. 1850, v. 72 ; Robin, 

 Teget. Parns. 1853, 895, pi. 4. figs. 5, 6. 



EXTERO'COLA, Van Ben.— A genus 

 of Copepodous Entomostraca. 



JE. eruca, is found adhering to the intes- 

 tine of Ascidia int^stinalis. (Brady, Cope- 

 poda, Pay Soc. i. 147.) 



ENTEROMORTHA, Link.— A genus of 

 Ulvaceee (Confervoid Algte), consisting of 

 freshwater and marine plants, with branch- 

 ed, tubular, green fronds, the walls of the 

 tubes being composed of a single flat layer 

 of polygonal cells. Reproduction by ciliated 

 zoospores, formed in considerable numbers 

 from the transformed contents of the cells 

 (PL 9. fig. 4). In this genus, Thuret states 

 that two foi'ms of zoospores occur, — one 

 large and four-ciliated ; the other, in fronds 

 with a yellower tint, smaller and with two 

 cilia; both kinds germinate. The zoospores 

 escape from the cells by a pore on the outer 

 surface (PI. 9. fig. 4 a) near the centre of 

 the cells ; and the latter persist for some 

 time in an empty condition. The marine 

 forms, of which nine species are described 

 by Harvey, are mostly from 1-2'" to several 

 lines in diameter, but many inches long. 

 JE. GrevUlei, Thuret {Uha Lactuca, Grev., 

 Harv.), however, is thicker and saccate, 

 finally bursting. E. intestinalis, which 

 grows both in the sea and in brackish- and 

 freshwater ditches, often attains a length of 

 2 feet and more, and varies in thickness 

 from 1'" to 2-3". 



BiBL. Harvey, Mar. Alg. 213, pi. 25 D, 

 Phyc. Brit. pls.^OS, 262, 282 ; Greville, Alg. 

 Brit. 179, Sc. Ci-ypt. Fl. t. 313, Eng. Bot. 



21.37 Sc 2328; Thuret, Ann. Sc. Nat. 3 sdr. 

 xiv. 224, pi. 20. figs. 8-12 ; M4m. de Clier- 

 bourg, n. ; Rabenhorst, Fl. Alg. iii. 312. 



ENTER0'PL1'L\, Ehr.— A genus of Ro- 

 tatoria, of the family Hydatinsea. 



Char. Eye-spots none ; teeth absent; foot 

 forked. 



E. hydatina (PL 43. fig. 27). Body co- 

 nical, hyaline ; foot small ; aquatic ; length 

 1-120".' 



Probably the male of Hydatina. 



BiBL. Ehrenb. Tnfus. p. 411. 



ENTODIN'IUM, Stein.— A genus of Pe- 

 ritrichous Infusoria. 



Char. Free, ovate, flattened; surface 

 smooth, indurated ; often with one or more 

 terminal spines. Three species ; in the ru- 

 men and reticulum of Ruminants. 



BiBL. Stein, Lif. ii. 168; Kent, Inf. 

 653. 



ENTOGO'NIA, Grev.— A genus of fossil 

 DiatomaceiB. 



Char. Frustules in side view triangular, 

 containing a central triangular figure, having 

 a broad border divided by transverse costse 

 into punctate or cellulate compartments : 

 = species of Triceratium. 



11 species. Barbadoes. 



BiBi.. Greville, Qw. Mic. Jn. 1863, 235 

 (figs.). 



EN'TOINIIS, Jones. — An estinct bivalved 

 Entomostracan, known by its oval, trans- 

 versely sulcate, and sometimes concentri- 

 cally wrinkled valves. The sulcus is nuchal 

 and much stronger than in some of the Oy- 

 pridiniform allies marked with this feature. 

 Silurian, Devonian, and Carboniferous. 



BiBL. Jones, Mem. Geol. Surv. Edinh. 

 1861, 137 ; Ann. N. H. 1879, iv. 183. 



ENTOMONETS, lL\xx.=Amnhiprora, pt. 



ENTOMOSTE'GIA. — One of D-Qr- 

 bigny's orders of Foramiuifera, having the 

 chambers in two rows, alternate, coiled 

 into a spiral. This alternation of chambers, 

 however, in the coiled Foraminifera arises 

 from very different modes of growth, and 

 is not a group-character. It is due : — 1, to 

 bilateral asymmetry (Cassididina) ; 2, to 

 lateral elongation and intercalation of the 

 chambers in Pobertina (Bidimitia) ; 3, to 

 extreme alar division with interdigitatiou 

 of the chambers on .one {-Ace (Amphisfegi7ia); 

 4, to irregular growth of semi-auuular 

 chambers (Heferosfegina) ; and 5, to tent- 

 like cavities imder umbilical flaps (Asferige- 

 rina). 



ENTOMOSTRACA.-A division of the 

 class Crustacea. 



