118 On a new Species of Solenella. 



my former paper, in all particulars except the foregoing. The 

 specimens are nearly all females with ova, and are of much 

 larger size than the two specimens of N. styligerum. 



XIV. — Description of a new Species of Solenella from South 

 Patagonia. By Edgar A. Smith, F.Z.S. 



The following species was collected by Dr. Robert O. Cun- 

 ningham, the naturalist, during the cruise of H.M.S. • Nassau/ 

 under the command of Captain R. C. Mayne, R.N., who was 

 sent to survey the Straits of Magellan in 1866. He dredged 

 it at the Otter Islands, which are situated in a channel which 

 branches northward from the Straits to the west of King 

 William IV.'s Land and east of Queen Adelaide's archipelago. 

 In his book entitled the ' Natural History of the Straits of 

 Magellan,' p. 448, this species is mentioned as a Yoldia ) but 

 this no doubt arose from the circumstance that the specimens 

 were only cursorily examined, for of course the presence of 

 the external ligament at once distinguishes them from that 

 genus. All the specimens, collected and excellently preserved 

 by Dr. Cunningham, have been presented to the British 

 Museum by the Admiralty. 



Solenella magellanica } sp. nov. 



Testa subelliptica, postice acuminata, mediocriter ventrieosa, leviter 

 insequilateralis, epidermide politissima, flavicante seu olivaceo- 

 flava amicta, intus alba, porcellana, incrementi lineis concentricis 

 parum rugosis et striis ab unibonibus radiantibus tenuibus antice 

 (interdum utrinque) sculpta ; margo dorsalis utrinque declivis, 

 antice curvatus, postice prope umbones aliquanto excavatus, deinde 

 rectiusculus ; ventralis fere regulariter, sed parum, arcuatus ; latus 

 anticum brevius subacuminate rotundatum, posticum subbreviter 

 rostratum, superne leviter excavatum ; ligamentum olivaceo- 

 nigrum, subelongatum ; dentes antici 10, postici circiter25; pallii 

 impressio lata profunda. 



Diam. longit. 19 mill., diam. transversa 35, crass. 11. 



In one very old and much thickened specimen the epidermis 

 is of an olive colour, but in all the others it is yellowish. 

 From the umbones to the end of the acuminate end there 

 runs a faint keel, at a little distance from the dorsal margin, 

 and between it and the margin the valves are slightly ex- 

 cavated. The epidermis, as is usual in species of Solenella y 

 is reflexed slightly within the shell. The interior displays no 

 trace of iridescence, but is thickened with a white porcellaneous 

 deposit; and it is curious that the two most adult specimens 



