oral a new Representative of it, S. Clapavedii. 3 



two more tentacles, one on each side, which might be deno- 

 minated posterior cephaUc tentacles or tentacular cir-ri; so that 

 we have in all six tentacles on the head — four anterior, and two 

 posterior. The small clavate papillfe mentioned above as oc- 

 curring in the spaces between the anterior tentacles, extend also 

 into the region of tjie posterior tentacles, but are not so closely 

 approximated, and from this point begin to change from the 

 elongate; clavate to a more globular form. I call attention at 

 once to this change, as it indicates at the same time ai. change 

 in the function of these cutaneous appendages, the anterior cla- 

 vate appendages being, in my opinion, organs of touch, whilst 

 the posterior globular ones are to be regarded as glands. The 

 middle part of the cephalic segment bears two reddish-brown 

 eyes, which arc placed a little within the bases of the two lateral 

 posterior tentacles. The segment of a spherical lens projects 

 from each eye forward and outward. 



The ce])halic segment, as already remarked with regard to 

 the segmentation in general, is not separated by any transverse 

 furrow from the first segment of the body, but passes into it 

 without any definite boundary. The first body-segment is 

 therefore determined partly by the inferior setiferous pedal tu- 

 bercles, and partly by the large globular cutaneous appendages 

 which at this spot pass like a ring round the whole body. I 

 say like a ring, and must call particular attention to this, be- 

 cause, singularly enough, these appendages are not only ar- 

 ranged transversely upon the dorsal surface between the two 

 lateral rudimentary feet, bat occui)y the ventral surface also iu 

 the same manner *. As regards the number, however, there is 

 a noticeable difference between those standing on the dorsal 

 and ventral surfaces ; for whilst on the back there are six of 

 these globular bodies in a row, there are only four on the ven- 

 tral surface. This condition, of course, tends greatly to sug- 

 gest the notion that tlie two outer lateral processes situated 

 upon the back over the pedal tubercles are to be regarded as 

 the two true dorsal cirri. But the two lateral structures are 

 perfectly similar to those standing in a row between them, 

 both in size and form. As regards their function, moreover, 

 there is no distinction ; all, as we shall see hereafter, are glands. 

 If, therefore, we were to call the two lateral processes dorsal 

 cirri, this might also be required for the other similar ap- 

 pendages situated on the back, and, in the same way, we should 

 also have to name the transverse rows situated on the ventral 

 surface ventral cirri. It would be no obstacle to such a conception 



* In Splicerodorum peripatus, as is well known, only one pair of these 

 globnhir cutaneous appendiigcs is situated upon each segment — one on 

 each side of the back. 



1* 



