934 



SYSTEMATIC HISTORY OF THE INFUSORIA. 



f. 4. = Schizonema lineatum, Me. Dal- 

 matia. 1-1320" to 1-1200". 



M. gracillimmn (S.). — Frond capillary, 

 simple below, sparingly branched and 

 submembranous towards the apices ; na- 

 viculPD crowded in irregular files ; valves 

 lanceolate, acute. = Schizonema gracilli- 

 mum, SD. ii. p. 79, pi. 59. f. 372. Tor- 

 quay. -0009". 



M, IJlyricum (K.).— Fronds forming a 

 dull-, obscure-green, mucous, intricate 

 stratum ; filaments very fine, simple (?), 

 soft, hyaline ; naviculse acuminate, lan- 

 ceolate, in dense series, indistinct when 

 dried. = Schizonema Illyricum, KB. p. Ill, 

 pl.22. f. 3. Trieste. 1-1680" to 1-1440". 



M. minufmn (K.). — Frond parasitic, 

 very short, fine, decumbent, subramose ; 

 branches tapering to acute apices ; navi- 

 culae acute, lanceolate, in few (2 to 4) 

 series. ■= Schizonona tninutum, KB. p. Ill, 

 pi. 23. f. 5. Adriatic Sea. Naviculae in 

 front view linear. 1-1176". 



2 * Frond composed of tubes longitudi- 

 nally connected. 



M. comoides (Grev.). — Filaments dirty 

 brown, coarse, membranaceous, elongated, 

 twisted, composed of parallel tubes ; 

 frustules crowded ; valves oblong-lan- 

 ceolate ; striae 48 in -001". = Schizone77ia 

 comoides, Grev. (scarcely of Agardh, 

 certainlv not the Conferva co7noides of 

 DiUw;^Ti); Hook. Br. F. p. 413 ; SD. ii. 

 p. 75, pi. 57. f. 358 ; Schizonetna araneo- 

 sum, KB. p. 113, pi. 25. f. 9. Flat rocks, 

 often in vast quantities. It is very re- 

 markable that this coarse, dirty-looking 

 species should ever have been confounded 

 with the Conferva comoides, Dillw. The 

 latter, we were assured by Mr. Dillw^n, 

 was totally imlike the present species, 

 and was correctly described by him. 

 Unfortunately Mr. Diilw}Ti was unable 

 to find an original specimen of his spe- 

 cies, but he believed that a very slender 

 simple-tubed Schizonema, of a bright 

 brown colour, which we once found in 

 great abimdauce in April, on the rocks 

 outside the Mumble Lighthouse near 

 Swansea, was the true Conferva co?noides. 

 The present species is usually twisted in 

 a rope-like manner, retains its colour in 

 drying, is very opaque, and does not 

 adhere to paper. 



M. ramosissimimi (Ag.), — Frond robust, 

 film, membranaceous, much branched; 

 branches short, swelling upwards ; frus- 

 tules minute, densely arranged in distinct, 

 parallel tubes ; valves oblong-lanceolate. 

 AD. p. 22. = Schizonema ramosissimum, 



Harv. Man. p. 210 ; SD. ii. p. 78, pi. 59. 

 f. 369. Europe. Somewhat resembles 

 M. comoides in appearance, but is less 

 elongated and less twisted. Does not 

 adhere to paper. 



M. apiculatum (Grev., Ag.). — Frond 

 robust, ultra-setaceous, cartilaginous, 

 irregularly dichotomous ; branches with 

 clavate ends, terminated by a mucro ; 

 secondary tubes distinct; naviculse mi- 

 nute, crowded; valves lanceolate. AD. 

 p. 22; KB. p. 117, pL 27. f. 10. = Schi- 

 zonema apiculatum, AA. p. 11 ; Harv. 

 Manual, p. 210. Scotland. 



M. corniculatum (Ag.). — Frond very 

 stout, cartilaginous, erect, rigid, subdi- 

 chotomous, much branched above ; ulti- 

 mate ramiili subulate and spine-like; 

 naviculse slender, lanceolate, contained 

 in distinct secondary tubes. AD. p. 24 ; 

 I^, p. 118, pi. 28. f. 2. = Schizone7na cor- 

 niculatum. Me. Adriatic Sea. Habit of 

 a small Fucus. 1-600". 



M. penicillatiwi (Chaiiv., Ag.). — Frond 

 thick and simple at the base, divided at 

 the apex into veiy numerous, penicillate, 

 fastigiate, capillary branches. AD. p. 23. 

 = Schizonema penicillatum, Chauvin ; M, 

 corniculatum /3, KA. p. 109. France. 



M. pallidum (Ag.). — Frond pulvinate, 

 rigid, subcartilaginous, stout, much 

 branched; ramuli suberect, abbreviated, 

 obtuse; navicidse minute, in lax series 

 within distinct secondary tubes. AD. 

 p. 23 ; KB. p. 118, pi. 28.*^ f. 3. = Schizo- 

 nema pallidum. Me. Adriatic Sea. 

 (xiv. 39-42.) Tufts hemispherical, 

 dense ; colour pallid, verging on brown- 

 ish yellow. 1-720" to 1-696". 



M. chondroides (K.). — Frond minute, 

 cartilaginous, olive-colom'ed ; teiminal 

 branches aggregated, clavate, obtuse, 

 here and there with hair-like spines; 

 series of naviculae and secondary tubes 

 very distinct, crowded; naviculse mem- 

 branous, flaccid, minute. KB. p. 118, 

 pi. 25. f. 8. = Schizonema chondroides, Me. 

 Adriatic Sea. 1-1380" to 1-1320". Sper- 

 matia immersed, globose. 



M. spinescens (K). — Frond dwarfish, 

 setaceous, slightly dilated upwards ; ter- 

 minal ramuli acute, spine-like ; series of 

 naviculae and secondary tubes crowded, 

 very distinct; valves lanceolate. KB. 

 p. 118, pi. 27. f. 11. = Schizonema spines- 

 cens, Me. Adriatic Sea. Navicidae in 

 front view oblong, trimcate. 1-960" to 

 1-720". Spermatia internal, globose. 



M. albicans (K.). — Frond setaceous, 

 whitish or olive-gTeen ; branches and 

 ramuli equal in thickness, fasciculated 

 or whorled ; naviculfe in distinct series, 



