Miscellaneous. 465 



depression or aperture formed by the turning-in of the wall towards 

 the interior ; this depression becomes a second vesicle, within the 

 former. It is at the bottom of this second vesicle that the Bcolex 

 sprouts forth. The latter increases in length until it can no longer 

 find room within the vesicle, when it issues out through the aperture. 

 It then exhihits a division into segments. 



The embryonal vesicle contains in its walls a great number of cal- 

 careous concretions. The authors found that Claparede was quite 

 right in supposing that the same relations would be found to exist 

 between the calcareous corpuscles and the vascular system of the 

 Cestoid Worms that he observed in the corresponding organs of the 

 Trematoda. These corpuscles are, in fact, lodged in inflated portions 

 of the finest branches of the vessels. The authors appear to think, 

 moreover, that there exist two vascular systems opening into the 

 same principal trunks ; one of these being in relation with the cal- 

 careous corpuscles, while the other has nothing to do with them. 

 The segments of the Echinobothrium separate from each other at 

 a period when the semen is not yet formed, which leads to the sup- 

 position that the proglottis-phase is of rather long duration. The 

 cystic form of the worm lives, as indicated by Van Beneden, in the 

 Prawns. 



Development of Spio. 



The authors describe nearly the whole series of metamorphoses of 

 a larva, belonging undoubtedly to the genus Spio. Some isolated 

 stages of these metamorphoses have been observed by Busch and 

 Loven, and perhaps also by Slabber and Oersted. In its young 

 state the larva has a somewhat elongated body, furnished with two 

 bands of cilia, one placed about the middle, the other towards 

 the posterior extremity. Subsequently the anterior portion is deve- 

 loped, so as to form two ciliated cephalic lobes, between which 

 the mouth is situated ; two bundles of setse make their appearance, 

 and the segments of the body begin to be indicated. Soon after- 

 wards the eyes appear, each segment acquires its bundles of setee, 

 and the larva gradually approaches the form of the perfect animal. 

 — Archiv fur Anat. und Physiol. 1858, p. 5. r ,ti ; Bibl. de Geneve, 

 1859, p. 73. 



On a new genus of Goat-sucker, and on a new species of Enicurus, 

 both from Darjeeling, from the Collection of Brian H. Hod^&on, 

 Esq. By George R. Gray, F.L.S. 



Otothrix, G. R. Gray, gen. nov. 



This bird differs from the Indian Batrachostomi in the smallness 

 of its bill, and in the general markings of its plumage, which agree 

 in some measure with the species of true Podargus. 



The feathers over the upper mandible in front of the head and 

 above the ears are much prolonged into fine hair-like bristles ; they 

 are composed of a long slender stem, having very slender branches 

 springing from the sides at various distances, and thus agreeing 



Ann. t$ May. N. Hist. Ser. 3. IV. iv. 30 



