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developed prostata glands. Above the penis remarkably large oil globules, and often 

 a great many others, deposited round and especially above the testis. There are three 

 pairs of strong longitudinal muscles for the wheel-organ and one shorter slanting 

 pair, further smaller muscles for the penis. When compressed three transversal bands 

 are observed. Size of male 100 /(, that of penis 20//. Size of female 200 — 250 /t. 



Anuræa cochlearis Gosse. 

 Tab. XIII, fig. 3—4. 

 Male: Description. Body broad, conical, broadest in the middle, tailless. Cu- 

 ticula thick with a rather well developed dorsal lorica, divided into three parts, a fore- 

 part which consists of a transversally placed rectangular part and two lateral elytralike 

 parts, separated from each other by means of a cleft. Ventral side without lorica. 

 Wheel-organ consisting of a single ciliary wreath, slanting ventrally, surrounding a 

 somewhat vaulted disc and pro^■ided dorsally with a bunch of long cilia. More 

 ventrally, where the opening for the mouth is in the female, is a curve of long cilia. 

 Four strong setæ. No alimentary canal. Brain large, with a red eye spot; a conspi- 

 cuous dorsal antenna before eye and two lateral antennæ near the hind edges of the 

 "elytra". Owing to the thick lorica the muscle sj'stem is difficult to observe. Two 

 lateral canals with three Yibratile tags, no contractile vesicle. Testis and penis con- 

 structed in quite the same manner as in A. aciileata. Special muscles for penis have 

 not been observed. We find at the end of the penis two quite similar long setæ 

 as in A. aculeata. Two small prostata glands. Above and around the testis a 

 number of large oil globules; one of them, lying directly over the testis, is com- 

 monly much larger than the other. Size of male 80 — 90/(, of penis 20/;. Size of 

 female 160— 200 jw. 



Anuræopsis hypelasma Gosse. 

 Tab. XIII, fig. 5-6. 

 Male: Description. Body elongate, very soft, hyaline without any distinct 

 lorica but dorsally with two and ventrally with one deep longitudinal furrow. No 

 foot. Wheel-organ almost vertical upon the longitudinal axis, consisting of a ciliary 

 wreath, encircling a disc, which, when slightly compressed, especially seen ventrally, 

 shows a central coneshaped and two lateral parts, the first equipped with about eight 

 to ten setæ, the lateral ones with a bunch of long cilia; between the three parts two 

 long strong setæ. No alimentary canal. Brain large with a large red eye. Neither dorsal 

 nor ventral antennæ have been observed. Two pairs of longitudinal muscles, running 

 from the wheel-organ to the root of the penis. Two conspicuous lateral canals with 

 three vibratile tags each; no contractile vesicle. A rather small elongate testis sur- 

 rounded by a large prostata mass. Penis of enormous and extraordinary length, more 

 than half the length of the body, very soft, flexible; ductus seminalis very long, 

 double-contured, with rather stiffened sides and ending in a cup-shaped body, sur- 

 rounded by cilia; internally the canal is covered with long cilia. No setæ at apex. In 



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