CAPE-VERDE GROUP. 521 



I possess a type of this Succinea, which was taken in the 

 ' Laguna da Kibeira Grande,' in S. Antao, by Dr. H. Dohrn, — 

 who speaks of it as allied to the S. oblonga, Drap., and the S. 

 vermeta, Say. Dohrn's diagnosis of it is as follows : — ' T. oblongo- 

 acuta, tenuis, diaphana, arcuatim striata, parum nitens, rubello- 

 cornea ; spira elongata, conica, acutiuscula, submamillata ; anf. 

 ultimus |- longitudinis subaequans, inflatus ; apertura obliqua, 

 ovalis, ad labri insertionem vix angulata, intus nitens ; columella 

 valde arcuata ; perist. marginibus subsymmetricis, callo junctis. 

 — Long. 9-10, lat. 4^-5; apert. long. 5-5^ milV 



Succinea Wollastoni. 



Succinea Wollastoni, Dohrn, Mai. BUitt. xvi. 13 (1869) 

 „ „ Morel., Journ. de Conch, xiii. 241 



(1873) 

 „ „ Pfeiff., Mon. Hel. vii. 39 (1876) 



Habitat S. Nicolao ; ad locum ' Top de Cachaz ' dictum cl. 

 Dohrn abundanter invenit. 



I know nothing of this species, which appears to have been 

 found abundantly by Dohrn at a place the ' Top de Cacbaz ' in 

 S. Nicolao. He speaks of it as related to the S. concisa, Morel., 

 and as being much coated, or thickened, like so many of the 

 Succineas, with a dirty crust. The diagnosis of it, as given by 

 Dohrn, is as follows : — ' T. oblongo-ovata, tenuis, diaphana, irre- 

 gulariter striata, pallide virenti-cornea, agglutinans ; spira 

 conica ; anfr. ult. % longitudinis subsequans, basi attenuatus ; 

 columella valde arcuata ; apertura oblongo-ovata, obliqua ; 

 perist. simplex. — Long. h\, lat. 3^ ; apert. long. 3^ mill! 



Fam. 6. LIMNiEIDiE. 

 Genus 12. LIMN^A, Drap. 



Limnsea auricularia. 



Limnoea auricularia [var.], Linn., Fna. Suec. 532, 2192 



(1761) _ 

 Limnagus auricularius, v. ribeirensis, Reib. Cat. (1865) 

 LimnaBa Kibeirensis, Dohrn, Mai. Matt. xvi. 15 (1869) 

 „ auricularia, Morel., Journ. de Conch, xiii. 242 



(1873) 



Habitat S. Antao ; in aquis, sec. cl. Dohrn, abundans. 



This Limno3a seems to be very abundant, according to 

 Dohrn, in the waters of S. Antao ; but if truly conspecific with 

 the common European L. auricularia, it certainly constitutes 

 a marked geographical phasis, — and as such indeed it was 



