3916 Arachnida. 



Planorbis raarginatus. Common. 

 „ vortex. Very common. 

 „ nitidus. Occasional. 

 „ contortus. Frequent. 

 Cyclostoma elegans. On a bank near the village of Belchamp ; 

 large, and mostly of a buff or clay-colour, without the beautiful pur- 

 ple spots which ornament the smaller variety usually found near the 

 coast. 



Cyclas cornea. Common. 



„ calyculata. Rather rare. 

 Pisidium pusillum and pulchellum. In drift. 



„ Henslowianum. Not very uncommon in the river. 

 „ amnicum. Frequent. 

 Anodon cygneus. Common. 



W. D. King. 



Sudbury, April 25, 1853. 



Occurrence of Eolis Landsburgii at Weymouth. — In my occupation here of collect- 

 ing living- animals and planls for the purpose of stocking the marine aquaria in the 

 Zoological Gardens, I have been so fortunate as to meet with some objects marked in 

 our lists as rare; I will however refer only to one species, Eolis Landsburgii, perhaps 

 the loveliest gem of all our nudibranch Mollusca. On the 23rd ultimo I took two 

 specimens of this charming amethystine Eolis within a few minutes ; both on the un- 

 der surface of stones near low-water mark (spring tide), but not in association with 

 each other. Eolis coronata occurred at the same time, and since, in unusually fine 

 condition : it is spawning about this time. These are the only littoral Eolididas that 

 I have met with here, except a single example of E. papillosa. When E. Landsbur- 

 gii was published by Messrs. Alder and Hancock, it was on the authority of a single 

 specimen. In the ' Annals and Magazine of Natural History ' for January, 1852, the 

 capture of a second is recorded by the Rev. Thomas Hincks, and the occurrence of a 

 third is alluded to. I am not aware that this rare and beautiful creature has been seen 

 since, until this twofold capture, which I now beg to record in the 'Zoologist.'— P. H. 

 Gosse ; Weymouth, May 16, 1853. 



Note on the Acarus of the Hornbill. — In the report of the Proceedings of the Zoo- 

 logical Society for March 8 (Zool. 3886), it is stated that Dr. Crisp, after exhibiting 

 a specimen of a hornbill, observed that the Acari of birds were never within the reach 

 of the bill. As this report is entirely erroneous, you will probably allow me to give my 

 own version of the matter. On looking over a few specimens of the hornbill (Buceros 

 Rhinoceros) with my friend Mr. Bartlett, he directed my attention to the enormous 



