410 DR. GWYN JEFFREYS ON MOLLUSCA OF THE [Apr. 16, 



3. Argiope cistellula, S. V. Wood. 



Terebratula cistellula, S. V. Wood, in Ann. & Mag. N. H. vi. 

 p. 253. 



A. cistellula, B. C. ii. p. 19, pi. 1. f. 2 ; v. p. 164, pi. xix. f. 4. 



Norway, Shetland to Guernsey, Ireland, Normandy, S.W. France : 

 20-45 f. 



I was wrong in referring this species to the Orthis lunifera of 

 Philippi, which is (at any rate partly) the young of Megerlia trun- 

 cata. I likewise mistrust the Mediterranean habitat cited by me for 

 a specimen of the present species, and have now omitted it ; the spe- 

 cimen was more probably the young of A. cuneata. 



4. Argiope cuneata, Risso. 



Terebratula cuneata, Risso, Hist. Nat. de l'Eur. merid.iv. p. 388, 

 fig. 179. 



Mediterranean, Adriatic, iEgean, and Canary Isles : 28-200 f. 

 Probably also Guadeloupe, 111-150 f. (Schramm, fide Crosse and 

 Fischer as A. schrammi). 



The shape varies from triangular to broadly oblong ; ribs two to 

 ten, more or less vanishing in some specimens, and altogether want- 

 ing in others. 



I have been favoured by Professor Seguenza with an opportunity 

 of examining his unique specimen of A. biplicata from the Straits of 

 Messina, and of comparing it with an extensive series of A. cuneata 

 and its colourless variety. The result of such examination and com- 

 parison, as regards both the outside and inside, compels me to con- 

 sider the specimen an abnormal form of A. cuneata. 



Terebratula soldaniana, Risso ; Anomia pera, v. Muhlfeld ; T, sco- 

 binata, Cantraine, not Anomia scobinata of Linne. 



Subgenus Gwynia. No septum. 



5. Argiope capsula, Jeffreys. 



Terebratula capsula, Jeffr. in Ann. & Mag. N. H. ser. 3, ii. p. 125, 

 pi. v. f. 4 ; iii. pi. ii. f. 7, 8. 



A. capsula, B. C. ii. p. 21 ; v. p. 164, pi. xix. f. 5. 



East and south of Ireland, Plymouth, Weymouth, Guernsey, 

 Etretat ; Sluys-kill, Zealand, near the Belgian frontier (Colbeau) ? : 

 8-25 f. 



I have lately opened and carefully examined more specimens of this 

 minute Brachiopod, as well as very young specimens of Terebratula 

 caput- serpentis, T. cranium, T. vitrea, Argiope decollata, A. neapo- 

 litana, A. cistellula, A. cuneata, Platydia anomioides, and Megerlia 

 truncata, of nearly similar dimensions. All of these last are cer- 

 tainly distinct from A. capsula in respect of the internal apparatus or 

 skeleton, which is nearly wanting in A. capsula. The young of 

 Platydia anomioides has, besides the septum, a very large byssal 

 orifice in the lower valve ; otherwise that species might be the adult 

 of A. capsula: but it has never been found with the latter species, 



