der marinen Tricladen. 107 



1. Bdelloura propinqua n. ü^. VV h i t lu a ii 1801 (360, p. 544— 54:5). 



V c r r i 1 1 1895 (354, p. 232—234). 

 V. Graf f 1903 (116, p. 37, 41, 51). 



2. „ „ B ö h m i g 190Ü (38, p. 206, 204). 



I. unterscheidet drei Limultts-FsiVSis'iten. 



„Another species, which I propose to call Bdelloura propinqua, 

 ia about 8 nun long, being about half as large as the fullgrown 

 B. Candida.'' (p. 1()9). 

 Betreffend die Verschmelzung der beiden hinteren Darmäste: 



,,In B. propinqua I have seen no tracc of it." (p. 176). 



,,In B. propinqua the brain with its ganglion covering is 

 separated from the surroiinding tissue by a layer of pccular fibrous 

 tissue. In specimcns mounted in toto, this layer appears as a pale 

 halo surrounding the brain and considerably in.creasing in its 

 appearent size." 



,,. . . In B. propinqua the testicular sacs are of about the 

 same relative size as in B. Candida, but nearly twice as numerous; 

 in one specimen I counted 170 on one side of the body, and this 

 is probably below rather than above the average number for this 

 species. Here, too, the sacs extend in between the gut diverticula 

 as compact rows, especially in the anterior ramus." 



,,. . . . B. Candida, B. propinqua and S. pellucidum all 

 deposit their egg-capsules on gill-lam.ellae of their host, Limulus . . . 

 B. propinqua selects the basal, or proximal region of the leaf. . . ." 



,,What I take to be the egg-capsule of B. propinquu, is con- 

 siderably smaller than that of the Bdelloura Candida, measuring 

 only 1,25 mm. It appears to contain only one ovum, instead of 

 2 — 7 as in B. Candida, but in this point I canjiot be positive. I am 

 unable to identify this form of capsule with any of those described 

 by R y d e r." (p. 186). 



,,B. Candida oviposits during May and early June, when 

 the Limuli return from the deep water to the sandy beaches to 

 breed . . . . B. propinqua appears to breed at the same time 

 as Syncoelidium."' 

 Speziesbeschreibung : 



,, Testicular sacs small, about 170 in number, lying on either 

 side of the body, cut extending inward a considerable distance 

 between the gut-diverticula, especially in the anterior region of 

 the body, brain enclosed in a fibrous capsule. Ijcngth when fully 

 grown, about 8 mm. Egg-capsule elliptical, length 1,25 mm." 



Es ist W h e e 1 e r s Verdienst, diese Art, die seit fast einem 

 halben Jahrhundert unerkannt blieb und als Bd. Candida galt, als selb- 

 ständige Art erkannt und genügend charakterisiert zu haben. Unzu- 

 treffend ist W h e e 1 e r s Angabe, daß das Epithel desselben rhabditen- 

 frei sei; auch die von mir festgestellte Hodenzahl deckt sich nicht 

 mit der von W h e e 1 e r angegebenen. 



