Radiata. 3811 



state ; and others, as well as myself, would doubtless be pleased for any further history 

 of them. When were they first observed in this country ? — R. Wakefield; 11, Sussex 

 Place, Regent's Park, February 5, 1852. 



Occurrence of the Larva of Diglossa mersa at Baldoyle, Ireland. — The discovery of 

 the larva of so singular and local an insect as Diglossa mersa, will probably be inte- 

 resting to some of the readers of the 'Zoologist,' and I therefore wish to make known 

 the following facts. On the 10th of August last, having proceeded to Baldoyle in 

 search of the perfect insect, which had been very abundant there a few weeks before, 

 I was surprised to find that it had almost entirely disappeared ; but in its place, under 

 the stones half imbedded in the sand, were numerous larva? moving about in exactly 

 the same peculiar way as the beetles themselves do when disturbed. With the ex- 

 ception of a dorsal stripe of a dark colour, their bodies and legs were perfectly white, 

 and in size, they were at that time about the same as the imago. Mr. Haliday, 

 though he has never taken them himself, agrees with me in thinking that these insects 

 must be the true larvae of Diglossa mersa. — Arthur R. Hogan ; Charlton, Dundrum, 

 near Dublin, February 12, 1853. 



Catalogue of the Echinodermata of Orkney. By William Balfour 

 Baikie, Esq., M.D. 



My friend Mr. It. Heddle and myself, being prevented by nume- 

 rous pressing avocations, from continuing at present, in a separate 

 form, an account of the Natural History of Orkney, are neverthe- 

 less anxious to have one or two of our lists of species published, in 

 order to show what has been done hitherto in that locality, and 

 also to preserve our claim to priority of publication. I therefore beg 

 to forward our " Catalogue of Echinoderms," for insertion in the pages 

 of the c Zoologist.' 



Order I. — Pinnigrada. 



Family 1. — Pentacrinitidce. 



Rosy Feather-star, Antedon decameros, (Comatula rosea). Tolera- 

 bly frequent. 



Order II.— Spinigrada. 



Family 1. — Euryalidce. 



Zetland Argus, Astrophyton arborescens. Two or three specimens 

 in Orkney, less rare in Zetland. 



Family 2. — Ophiuridae. 



Common Sand-star, Ophiolepis ciliata, (Ophiura texturata). Very 

 abundant. 



