Miscellaneous. 467 



•was pretty fully stated. It will be found in my paper that I expe- 

 rimented on various species of the family, and pointed out some •which 

 gave no indication as to sensitiveness to light, while others were 

 particularly sensitive, especially the Unio radiatus, Lam. I there 

 stated that the visual organs were placed on the fringes of the 

 siphonal opening — that " with a good lens the terminal point of 

 the tentacula may be observed to be rounded and furnished with at 

 least the appearance of an eye ; and that it would prove to be a true 

 eye, however imperfect, there can be little doubt." I also stated 

 that I left the subject to Dr. Leidy, believing that " he would be 

 able to make out the complete anatomy of the eye of the Unio." 



It was mentioned also in this paper that the females were more 

 sensitive to light than the males. 



Subsequently, in the introduction to my vol. vi., " Observations on 

 the Genus Unio," &c, I mentioned the subject again, and stated that 

 I had found that the Unio rubininosus, Lea, U. eyUndrictu, Say, and 

 An. imbecillis, Say, "were all sensitive to light. 



On referring to my notes made since the above-mentioned pub- 

 lication, I find that during the years 1858-60, 1 found the following 

 species " very sensitive to light/' viz. Unio sub solan Jus. Lea, U.pyra- 

 miJatu£,~Le&, U.obscurus, Lea, U. pustulosus, Lea, U. ^Esopus, Green, 

 The further investigation of the subject is well "worthy the attention 

 of malacologists "who are so situated as have all the conveniences of 

 exploration, investigation, and time. — Silliman's Journal, May 1869. 



On a new mode of Development of the Siphonophora. 

 By A. Pagexstececee. 

 The author describes a new young form of Siphonophore captured 

 by him at Mentone. It consists of a spherical membranous envelope 

 cut off as it were at one pole, reaching a diameter of half a centimetre, 

 within which a small Siphonophorous colony is suspended by a short 

 cord. The attachment is effected in such a manner that there is 

 upon one side of it a portion comparable to the swimming-column, 

 but not furnished with pieces differentiated into bells — and on the 

 other side the axial filament or stem, on which polyp-bodies are 

 gradually developed by notching of the margin ; these subsequently 

 develope urticating apparatus at their base, and each draws out a 

 separate peduncle. — Yerhandl. des Naturh. -medic. Vereins zu Heidel- 

 berg, Band iv. p. 196. 



Anomalurus fulgens, a new Species from the Gaboon. 



The British Museum has just received a specimen (without the 

 skull) of a beautiful and distinct species of Anomalums from the 

 Gaboon. The tail is short, and studded with distinct spines on the 

 underside of the base. The fur is very soft and bright, nearly 

 uniform orange -red ; the head rather brighter, with a tuft of white 

 hairs at the outer side of the base of the ears. The underside is 

 rather paler, and whitish on the sides of the abdomen. The upper 

 lip is yellow. The tail is very slender, pale brown, with a pencil 

 of darker hairs at the tip. The hair of the back is pale red for the 

 greater part of its length, with bright dark-orange-red ends, which 

 are frequently terminated by a pale-yellow tip. — J. E. Gray. 



