LABRELLA. 



[ 377 ] 



LAGEN^. 



LABRELLA, Fr. — A genus of Phacidiacei 

 (Ascomycetous Fungi), growing upon living 

 leaves. L. Ptarmicce, Desm., grows upon 

 the leaves of Achillea Ptarmica. 



BiBL. Berkeley, Ann. Nat. Hist. i. p. 208. 

 pi. 7' fig. 7 ', Fries, Summa Veg. p. 422. 



LACE-BARK. See Thymeleace^. 



LACINULARIA, Oken. — A genus of 

 Rotatoria, of the family Floscularisea. 



Char. Eyes two (when young) ; urceoli or 

 gelatinous sheaths aggregated into a spheri- 

 cal mass ; rotatory organ with two lobes. 



L. socialis (PI. 41. fig. 15). Urceoli ge- 

 latinous, yellowish; rotatory organ very 

 broad, in the form of a horse-shoe; aquatic; 

 length 1-36". 



BiBL. Ehrenberg, Li/m5. p. 403 ; Huxley, 

 Microsc. Journ. 1852; 'Leydig, Siebold and 

 Kolliker's Zeitschr. 1852; Ukedem, Ann. 

 des Sc. nat. 3 ser. 1851. 



LACRYMARIA, Bory.— A genus of In- 

 fusoria, of the family Enchelia, E. 



Char. Body rounded behind, not ciliated ; 

 with a long and slender neck, which is di- 

 lated at the end, and furnished with a ciliated 

 mouth and a lip, but no teeth (= Trachelo- 

 cerca without a tail). 



L. proteus. Body oblong, turgid, colour- 

 less, with delicate oblique striee ; neck very 

 long; aquatic; length 1-140". 



Two other species ; one {L. gutta) colour- 

 less and without striae; the other (L. rM^^osa) 

 containing green matter, with the body 

 wrinkled. 



Dujardin states that the body is ciliated; 

 and unites the genera Tracheloc€rca,'E. with 

 Lacrymaria, appending Phialina, and pla- 

 cing the extended genus in the family Para- 

 mecia. 



BiBL. Ehrenberg, Infus. p. 309; Dujar- 

 din, Infus. p. 468. 



LACTATES. See the bases. Lactate of 

 hme (PL 7. fig. 19), lactate of zinc (PL 7- 

 fig. 20). 



LACTEALS. See Villi. 



LADY-BIRD. See Coccinella. 



LAEMARGUS, Kroyer. — A genus of 

 Crustacea, of the order Siphonostoma, and 

 family Cecropidse. 



L. muricatus. Found upon the sun-fish 

 {Orthagoriscus moIcb). Length of female 1"; 

 male much smaller. 



BiBL. Baivd, Brit. Entomostraca, 1^.293. 



LAGENiE. — The systematic position of 

 the animals thus designated has not been 

 determined, in consequence of the structure 



of the animal being unknown. They are 

 microscopic, contained within calcareous 

 shells, of a very curious flask-like form (PL 

 19. figs. 16-21), furnished with a longer or 

 shorter neck, and frequently with a tube 

 continued from it into the cavity of the shell; 

 sometimes also with a stalk-like process or 

 spine attached to the base. In some the 

 shells exhibit very minute foramina, resem- 

 bling those found upon the shells of the 

 Foraminifera, or are covered with distinct 

 depressions, and sometimes with longitudinal 

 ribs. Whether the animals agree in struc- 

 ture with the Foraminifera, or whether they 

 consist of Polypes, remains to be decided. 

 The former being the more probable, we 

 have arranged them provisionally with the 

 Protozoa. Mr. Clark considers that in the 

 natural state they are fixed by a spine-like 

 process at the base, the primary (basal) shell 

 to foreign bodies, the succeeding shells to 

 those beneath them in linear series; and that 

 the separate forms illustrated in the figures 

 referred to above, represent fragments of 

 the perfect organisms. 



They are marine, and found living attached 

 to fuci, stones, &c., and fossil in sea-sand 

 and mud. 



They have been divided into two genera, 

 Entoselenia and Lagena proper. The cha- 

 racters of the former are given under that 

 head. 



Lagena. Cell calcareous, single, globular, 

 ovate or cylindrical, with a long, produced, 

 external neck, projecting from the upper 

 extremity ; cavity simple. 



L. IcEvis (PL 19. fig. 16 «; h, section). 

 Cell ovate or claviform, sometimes narrow 

 and much elongated, with a long, slender, 

 tubular neck, somewhat contracted near the 

 outer orifice, which is surmounted by a nar- 

 row rim ; surface smooth and shining, co- 

 vered with very minute foramina. Length 

 1-100 to 1-50". 



/3 amphora. Cell elongated, with a spine 

 at the base, or fusiform. Length 1-50". 



L. gracilis (PL 19. fig. 17). Difi^ers from 

 the var. /3 of the last in the surface being 

 marked with longitudinal striae. Length 

 1-55". 



L. striata (PL 19. fig. 17). Cell ovato- 

 claviform or spherical, with parallel, coarse, 

 longitudinal striae or ribs. Varieties exist 

 in the length of the ribs. Length 1-100 to 

 1-50". 



L. substriata. Striae verv faint. Length 

 1-65". 



BiBL. Williamson, A7in. Nat. Hist. 1848. 



