85 



Stat. 148. o°i7'.6S., 129° 14'. 5 E. 3 spec. 



Stat. 157. o°32'.9S., 130° 14.6 E. 3 spec. 



Stat. 172. Between Gisser and Ceram-Laut. 6 spec. 



Stat. 1 85. 3° 20' S., i27°22'.9E. 9 spec. 



Stat. 203. 3°32'.5S., i24°i5'.5E. 18 spec. 



Stat. 205. Lohio Bay, Buton Strait. i spec. 



Stat. 216. 6° 49' S., 1 22° 43' E. I spec. 



Stat. 243. 4°3o'.2S., 129° 25' E. 2 spec. 



Stat. 245. 4°i6'.5S., i30°i5'.8E. 2 spec. 



This species was found Ijy tlie Challenger off Mindanao. It seems very common in the 

 East-Indian Archipelago, and by far more numerous than any other Gymnosomatous form. 



Anatomical Remarks. 



S'kin: without pigment, of a yellowish colour. The body-wall is very thick on the trunk, 

 but not on the head. The animal 'can entirely retract into its tough envelopment; in this 

 case two extensions (dorsal and ventral, of which the dorsal is more developed) cover the head 

 and its cephalic appendages in such a way, as to form a frontal fissure. In this contracted state 

 the animal, indeed, suggests at first sight some Cymbiiliopsis. 



The skin is well provided with dermal glands which are visible, even to the naked eye, 

 as small wdiite spots (in formol-preservation). Transverse sections through the skin show its 

 structure sufficiently (PI. VI, fig. 154). At the surface is found an epithelium (i) of flat cells 

 with distinct nuclei ; on surface view these cells appear to be polygonal. Beneath the epithelium 

 there is a layer (more or less thick) of elastic fibres. In this layer the glands are situated, and 

 they attain a differentiation which is not found in other Gymnosomata, for aught I know. Yet 

 they are all unicellular glands, in which a nucleus is always present. Some of these glands are 

 very small, goblet-shaped (3), while others (4) are larger, more slender and pyriform, the contents 

 of which absorb much colouring matter so as to become diffusedly coloured. The walls of these 

 glands are simply membraneous without distinct structure. Finalh' a third form is represented by 

 very large glands (2), with a short efferent duct and with granular contents. The walls, w^hen cut 

 tangentially, show striae, (perhaps they are muscular) crossing one another in several directions. 



The layer of elastic fibres between which nuclei are scattered, together with the surface 

 epithelium, make up the skin (fig. 154, a). Beneath this skin is found the usual layer of 

 branched stellated cells {b). 



Head: the head is extremely small and difficult to distinguish. On the one hand this 

 is due to the absence of a cephalic hood, on the other to the great development oi the 

 cephalic appendages. As to the latter, the great confusion reigning with respect to a right 

 interpretation of buccal appendages and tentacles was not cleared up until Pelseneer came to 

 the fore-ground. I may therefore refer to his paper. 



Foot: the foot is somewhat differently shaped from what is usually found in the 

 Gymnosomata. The anterior lobes (fig. 153, «/) are free for the greater part; the posterior lobe 

 (//) is not separated from the fins, but distinctly attached to it. I have already said, that 

 this statement does not at^ree with that of Bo.vs or Pelseneer. 



