69 257 



de ces éléments sont réunis aux environs de l'un des pôles; les éléments plus petits entourent 

 le pôle oi)posé. La cavité du s|)ermatophore est circulaire, mais cxcenlrit|uenienl placée, de 

 sorte qu'au niveau des éléments cliitineux les plus petits, la paroi est aussi la plus mince. 

 Le canal contenant un spermatophorc a perdu son aspect glandulaire, le produit de sécrétion 

 jaunâtre de ses cellules a disparu, il est probablement utilisé à la formation du spcrmatophore." 



Description: The form of the male differs only very little from thai of the 

 female, but the head is not so conical, and the whole body somewhat narrower. 

 The wheel-organ is a simple ring of cilia, surrounding the conical cone, it has no 

 interruption dorsally or ventrally; at all events it is only very small. On the top 

 of the conical disc there are two tufts of hairs; seen laterally, only one tuft is ob- 

 served. I have not been able to detect prominences, carrying styli. The wreath is 

 situated upon a ring of hypodermal cells. In the place where the mouth is in the 

 female, is found a peculiar globular bodj', often provided with a prominence, formed 

 Hke the beak of a parrot; to this globular body is fastened a long band, narrow 

 in its anterior part, broader in the middle and narrower again near the testis, to 

 the upper part of which it is fastened, and which it embraces. I am not quite sure, 

 that this band is not hollow since it contains many globular bodies of different 

 size which resemble oil globules, and which are not commonly found in any other 

 part of the body. They are also indicated on the figures of Hudson-Gosse (PI. XII, 

 fig. 2 c) and Weber (1898, Tab. 16, fig. 8); a histological examination would indeed 

 be very desirable. That the whole apparatus functions as a suspensor testis is in 

 my opinion without doubt; on the other hand that morphologically it may be re- 

 garded as a rudiment of the alimentary canal is highly probable; the above-named 

 globular body, lying where the mouth of the female is, may most probably best 

 be regarded as a rudimentary mastax; like other rudimentary organs its stage of 

 development undergoes large individual variation. The brain is mainly an elongate, 

 large pear-shaped body, sending off forwards nerve threads to the cup-shaped disc 

 and backwards threads to the two dorsal aiitennæ, situated before the middle of 

 the body and two ventrally more behind; the heads are very broad, carrying on 

 their blunt rounded outer ends long radiating setæ. On the underside of the brain 

 is the large red eye; upon two prominences in the wheel-organ, two other some- 

 what smaller eye spots. 



Of the longitudinal muscles we especially call attention to the two pairs of 

 very strong muscles, running almost through the whole body; the two ventral ones 

 are cleft near the corona and fastened to the above-named globular body; with the 

 other end they are fastened to the cuticula, very near the testis and perhaps to this 

 very same organ. The dorsal pair are fastened to the hypodermal cells of the corona 

 and follow the intestinal band or suspensor testis, to which this is fastened; the 

 other point of attachment is dorsally, almost in line with the first-named pair. 

 These two powerful muscles draw in the wheel-organ. Near the middle of the body 

 and near the two strong dorsal muscles is a point in which most of the other slighter 

 muscles meet. At this point there are two long cleft muscles, which are fastened 



