Lrfg, 



he Martled liy the sudden appea ranee of masses of dan\ color in 

 the water. Miid in t lie confusion H M . cuttle makes liis escape. 

 W. K. Hr.-MKs. in Nature, ix. 363, 1*74. 



DOI-SM! aquiferous pores are found opening upon 1 lie head in 

 Argonaut a and Tremoct opus : they coinniunicat e with I 

 internal cavities. In < )mmast replies and Trenioctopus anal ].. 

 with small ca vit ies. are found on each side of the siphon; in 

 Onyclioteuthis they are placed in advance of if; in other genera 

 they are wauling. The buceal region in H ist ioteiithis and Oni- 

 mastrephes has four aquiferous pores, and there are six of them 

 in Onyclioteuthis. in Sepia and in Loligo: the other genera want 

 tin-in. Finally, there are l>rachial pores situated near the i 

 of the tentacular arms and between the third and fourth pair- of 

 <e>sile arms: in Sepia. Sepiola and llossia they communicate 

 with the "Tent cavities in which are lodged the tentacles when 

 contracted ; in Loligo the smaller cavity only sutlices to lodge a 

 portion of the tentacula. and in I listioteuthis. ( hnmast replies 

 and Onychotent his the cavity is still more rest ricted. and only 

 OCCiijties a part of the head anterior lo the eyes: wanting in 

 other genera. These pores are probably lubricative in function. 



Sexual <)r<i<rit*. 



The sexes arc distinct in the cephalopoda and in some of the 

 genera at least, t he female individual is the largest and readily 

 distinguishable externally. The reproductive organs are lamellar 

 or branched; their cellular contents are metamorphosed into ova 

 or spermatozoa, which are attached to the \\all of a chamber 

 communical ing with the pallial cavity by one or two ducts, which, 

 in the female present glandular enlargements. I'pon the walls 

 of the branchial cavity <f the female two nidimeiital gland- 

 developed ; besides, sometime^ accessory glands, within which is 

 secreted a viscid lluid which envelops the ova and ag 

 them into various fonnx. diifi-ring according to the genus. 



In tin: male the ca>e- or sperniatophon-s containing the sj>er- 

 mato/oa arc furnished by a prosfatic gland. 'I'licse spennato- 

 phores. in the dibi-am-hiat a are ovate, cylindrical and narrow, 

 consisting of a thin case, ending sometime^ in a lilameni at one 

 end; at the other or thicker end is contained a sack full of 

 spermato/oa. to which is attached an elastic spiral cord, coiled 



