PRESIDENTIAL ADDRESS. 525 
Grimalditeuthide. 
Grimalditeuthis ‘ Pw i 
Cranchiide. 
Cranchia(8) . - . 4R8.; stout, keeled, suckers in four rows, closely packed 
near the tip; 3 R. and L., with small closely packed 
suckers. 
Liocranchia (8) : . 41.; suckers in a single row at the tip. 
Leachia : - A es 
Zygenopsis (8) . d . 4R.; enlarged with closely packed suckers in two rows. 
Taonius u 
Corynomma . 
Crystalloteuthis 
Sandalops : 
Toweuwma . : ° 
Bathothauma . 
ewe ST 
The following genera, whose systematic position is uncertain, or whose validity is 
doubtful, have been omitted: Zritaweopus, Hoylea, Promuchoteuthis, Compsoteuthis, 
Micrabralia, Thawnatolampas, Brachioteuthis, Stigmatoteuthis, Chiroteuthopsis, 
Galiteuthis, Desmoteuthis, Owenia, Taonidium. 
An inspection of this table shows, first of all, that where hectocotylisation is 
known to take place it affects either the first, third, or fourth pair of arms; no 
instance is yet known where the second pair is modified, except in subsidiary 
relation to another pair, or in one or two rather doubtful cases in which all the 
arms are said to be modified. It appears, furthermore, that hectocotylisation of 
the third pair is confined to the Octopoda, whilst the first and fourth pairs are 
affected in the Decapoda, so that, as far as the main divisions of the Dibranchiata 
are concerned, the position of the hectocotylus is acorrect index to them. We 
may, however, go a step further still, and point out that in every family, with 
one exception, the position of the hectocotylised arm is constant within the limits 
of the family, so that there is a very strong prima facie case for the truth of Pro- 
fessor Steenstrup’s dictum. The difficulty arises when we come to consider the 
family Sepiolide and its allies, and endeavour to form an idea of their relation- 
ships to each other. 
Steenstrup was so convinced of the truth of his thesis that he classified the 
Myopsida thus :— 
SEPIOLINI. 
Sepiola , , - =, eld: 
Rossia . : : : : dia ligt) Vigne 51 
Heteroteuthis . : 1L& Rk. 
SEPIO-LOLIGINEI. 
Eusepii. 
Sepia : : ; oe baba: and Bp 
Sepiella . : ; : . . 40. 
Hemisepius  . d - : chats 
Sepiadarii. 
Sepiadarium . : : : pet MLE 
Sepioloidea : 41 
Idiosepii. 
Idiosepius  . - : ‘ » 4R& 
Spirula . ait 7 ° . _ £h & LG 
Loliginei. 
Sepioteuthis . : : ‘ amie Ls, 
Loligo . ; ; : 3 . sors. 
Loliolus . ; Sib pew ty Coals 
