80 



LIMAX FLAVUS. 



Fn'.. 101. — Cephalic retrac- 

 tors of Z //'/ii.r /Azr'7/i", X '1, 



anil a stoinacli tract all 



nucT or I'RDSTATK is thick and yellow, with an inmieiisc nuinher of minute, white, 

 calcareous roils within its walls; the ONiiiuCT is yellowish, (,'ut-like, anil thick- 

 walleil, lint after separating,' from the inostate it narrows ilown ami lias thin walls, 

 ilitlerinj,' in structure from the niiper allnimen-secretini^- section; as it ajipioaches the 

 atrium it swells out, heciunes thick-walleil, ami exhihits internally a succession of 

 close set ;,'landular riili,'es and hiiglit jmrple-red eiiithelium ahove; the fnsifi^rni 

 si'KKMATiiECA which Opens into the FKEK-OA'UiliCT in this region often contains a 

 reddish substance, probaldy derived from the oviducal glands, and intended to aid in 

 the preservation and vitality nf the sjierTnatozoids ; tlie 

 rEN'is-SHKATlt is long and cylindrical with a pronounced 

 iloulile flexure, connected hy tissue which sometimes also 

 involves the VAS iiEFEEENs'and retractor; the latter is 

 terminal, very long and rilibondike, and lixed to the dor- 

 sum between the heart and the kidney; the penis-sheath 

 has no interior crest, but in the lower half there are two 

 projecting, longitudinal muscular rolls, ^-hile the walls 

 abo\'e are thinner w'ltW many fine tians\'erse plications. 



The CEPHALIC RETR.\CTOR arises usually in two or 

 more roots beneath the hind margin of shield, ami sooner 

 or later unite into a short and stout band ; about two- 

 tiftlis of the total length of the retractor from the ba.se, it 

 divides as usual into the I'harvnoeal and tentacul.vr 

 branches; the pharyngeal bifurcates and Hxesby the bilid 

 end beneath the buccal bulb ; the retractors to the oninia- 

 tophores expand and become very bulky, but the subsidiary 

 muscles to the anterior tentacles are comparatively slender, while the slip to the lips 

 is unite short and insignihcant. 



The AT,IMENTARY CANAL has the five intestinal coils 

 ^\'ithout twist, and \'isible abo\'e the visceral mass \vhen 

 tlie body is opened, as in the tyiiical Limaces ; the intes- 

 tinal coils are also held in positimi anteriorly, as in L. 

 ■jiut.riiaiis,^ by looping the aorta and the cephalic retractor, 

 but differ in the presence of the rectatheca or cieeum, 

 A\'hicli is, liowever, only slightly attached to the rectum, 

 and extends in the median line of the body nearly to the 

 tail-end. Simroth suggests that this apjiendage may act 

 as an absorbent and imbibe the chyme from the intestinal 

 canal by an antiiieristaltic motion. The sai.iv.vrv 

 ci..\NIiS are white and woolly, with a rather long dtict 

 to each ; (Ksol>iI.\i!ii,s slimt and pinkish-brown in colour, 

 widening almost immediately after )iassing the 7ierve-ring 

 into the CKiU', \vliicli is bi-ownish in eoiimr wilh white 

 veins and irregularly furrowed longitudinally ami trans- 

 versely ; the LIVEK or liicivSTlVE CL.VNl) is Usually of a 

 yellowish grey, and consists of two main lobes connected 

 each by a single duct to the digestive tube; the KrnNEV 

 is brownish or in part crocus-yellow, ami opens near the 

 termination of the rectum in front of and at the upper 

 jiart of the pulmonary aperture. 



The srANnir.LK- or jaw is of a ilee]i brown colour, strongly arcuate from fmut to 



bark, smocith, wilh a blunt liut )pr ineiit medi.an rostrum or lieak, which projects 



boldly in fiiint and bene.ath, ends eon\e.\lv niiinded, .and the upper part imheililed 

 in the llesh well marked. 



'J'he LlNi:U-VL Mi;\IiiK.\\ic id a Cambridgeshire specimen, for which I am indebted 

 to the Re\. I'nif. Cwatkiu, shows an obscurely tridentate meilian tooth, the nieso- 

 coiu^ 

 notii 



Fig. 102.- .Vliment.iryc.-itial 

 of /. iina.v /?ii7'iis, sliow ins the 

 posteriorly directed appendix. 



large and well de\eloped, lint the ei-tocones 

 ■cable cutting points ; the laterals display the 



not well marked and without 

 same ch.ar.-ti'teis, the mosocone 



Km;. l(i:;.--Represent.itive ilenlicles from a transverse row of the lingual teelli of/.. /Airvn- L X 121) 

 the animal r,,llected m Caml.ridgeshire, and the palale prepared by the Rev. j'o.f. (iw.ukin. 



1 MonoR., i., p. 2S5, IT. ,570, ;)7I. 2 Monog., i., p. 2,Vi, f .Ml. 



