2 [-2 



ARIIIN INTEEMEDIt'S. 



undui-jioiie are v i.t.v sinular to what is fouiRl in A. ciiruiHscn'jitiis. Tlie DICiESTIVE 

 (_iLANU is j,'reuiiiNli-,y(jll()win colour, with its lolmles not veiy coherent, and iliscliarges 

 into tlie STo:\iAOll at tlie terndnatiou of the IXOUSTIVE thact. 



Fig. 241. Fjg. 21,5. Eic. 24G. Fig. 2i7. 



Alimentary and Reproductive organs of A rion intenjtedius Normand and A. moUerii Pollonera. 

 Fig. 244. — Alimentary canal of A. intermedins Normand X 4. (Raheny, Co. Dublin). 

 Fig. 24.5. — Reproductive organs of A. intertnedius var. appenina X 2 (after Pollonera). 

 Fig. 246. — Reproductive organs of ^. ;«iMzV««j Simroth X 3 (after Simroth). 

 Fig. 247. — Pro.\imal end of the Reproductive organs of A . jnollcrii^ magnified (after Pollonera). 



The EEPRODUc' I'lVE ORGAN.s are chai-acterized by their simple outlines. The ovo- 

 TE.STIS is roundish, with dark purplisli acini, am! lusts npon the upper surface of the 

 digestive gland, just beyond the distal end of the stomach; the llEEMAI'iliiiiDlTE 

 DUCT is only \ery slightly sinuate, the pro.ximal end thick; V.VS DEFERENS some- 

 what short, enlarging into a moderately long and cylindrical EPIPHALLUS or 

 spermatophore tract, without complications or windings, Ijut M'liich is furnished 

 internally with longitudinally arranged rows of papilhf, from which it niay he 

 inferred that the .spermatophore is serrate, as in Arimi i(fn- and A. unhfiistua ; 

 FREE OVIDUCT short and uniformly cylindrical ; tlie GENiTAi. RETRACTOR is not 

 easily found, but is attached to the free o\idnct and stem of spermatheca, as is 

 usual in the genus ; the si'Kkmatiieca is somewhat globular with a funnel-shaped 

 stem; the three terminal organs open into a moderately large light yellow glandular 

 atrium, which is somewhat quadrilateral in ligure. 



The M.VNOlliLE or jaw is very delicate, and le.ss 

 than a millimetre in width, slightly semi-lunar in 

 shape, with attenuate but rounded ends, and of an 

 amber colour, with Kve very broad but very feebly 

 convex ribs, whicdi extend over the whole surface of 

 the jaw, and give an undulate aspect to the lower or 

 cutting edge; a darker line extends medially acro.ss the jaw from side to side and 

 parallel with the cutting margin, indicating the point of attachment of the elasma. 



The LiNdUAE MEMiiRANE is about two mill, long, and bears about ninety some- 

 what curved transverse rows of teeth, each row composed of a distinctly tricuspiil 

 median tooth, the long and somewhat slender mesocoue with lateral cutting expan- 

 sions ; the lateral teeth are as usual practically and strongly bicuspid, the endoconic 

 cutting point being obsolete ; they gradually pass by a series of transition teeth to 

 the true marginals, wliich are strictly bicuspid, the endocoue being gradually lost, 

 but in the few extreme marginals the embryonic character is retained, the denticles 

 being wide and showing indications of one or more cctoconic ilenticles. 



Fig. 248. — Mandible or jaw of 

 ■I. interniedius Normand X 20. 

 (Raheny, Dr. R. F. ScharfF). 



^<^' " =' 



^ ^ V) ^ @fiQ ft 



p^ 



Fig. 2t9.— Representative denticles from a transverse row of the lingual teeth'of .). intermedivs X 180. 

 The animal collected by Dr. ScharfT, and the palate prepared by Mr. \V. Moss. 



Tlii^ formula of a Raheny specimen collected by Dr. Scharff is 

 S+;!H-'l'!f + ^ + f;, + S + 8xllH = G,390. 



