182 Misce Uaneous. 



that the ink-bag does not present the modifications supposed to 

 occur in it, but that the form of the bag corresponds to other cha- 

 racters of systematic importance and also frequently to a different 

 habitat. 



The following table, taken from Steenstrup's 'Notse Tenth ologicse,' 

 furnishes an 



Ayialytical Key to the Species of the Genus Sepiola from the 

 Mediterranean, the Atlantic, and the North Sea. 



A. Ink-bag trilobate or auriculate ; tins ex- 



ceeding in length the half of the mantle 

 (equal to f of the mantle). 



a. Suckers of all the arms biseriate I. S. Rondeleti, Leasli. 



j8. Suckers of the ventral arms pluriseiijite 

 (4-seriate) at the apex ; suckers of the 

 other arms biseriate 2. S. atlantica, d'Oih. 



B. Ink-bag simple or pyriform ; tins nearly 



equalling half the mantle, but never 



longer thim half. 



CI 1 i< 11 ii 1 • • i \ 3. »S'. Peter si, St. 



a. Suckers of all the arms biseriate .,..{. ^ ;• u. 



j 4. o. scanaica, St. 



/3. Suckers of the ventral arms pluriseriate 



at the end ; suckers of the tither arms 



biseriate 5. S. Oweniana, d'Orb., St. 



All these species (1-5) differ from each other by the clubs of the 

 tentacles, as regards the relative size of the suckers, and the number 

 of longitudinal series and of the teeth in the horny rings. S. Owen- 

 iana, especially, diifers from all the rest in the very small suckers of 

 its clubs. The valve of the funnel in the males is half or one third 

 of the size of that of the females : it seems to be entirely wanting 

 in the male of Sepiola scandica (?=/S. Rondeleti of the English and 

 Scandinavian faunas). The species with long fins (1 and 2) have 

 lanceolate cultriform sepiostcga. Those with short fins (3-5) have 

 narrow, linear, or setiform sepiostega, to some extent resembling 

 those of the type species of the genus Miotetdhis, Verrill. The other 

 species of that genus are referred by Steenstrup to a new genus 

 under the name of Euprymna. 



The commonest species in the North Sea and the Pas de Calais is 

 Sepiola atlantica, d'Orb. At Eoscoff S. atlantica seems to be less 

 common, and the dominant form is S. Rondeleti or S. scandica, both 

 of which occur. From a statement of M. Girod it seems probable 

 that S. Oweniana also exists at Itoscoif. 



According to M. Girod a specimen of S. atlantica obtained by 

 dredging had the ink-bag simple : all the individuals seen by tlio 

 author had it trilobate. M. Girod based his identification solely 

 upon the pluriseriate sucJce7'S, the possession of which combined with 

 the simple ink-bag is shown by the above table to lead to /S. Owen- 



