602 SCIENTIFIC RECORD FOR 1882. 



tacular arms clavigerous and armed with horny claws or hooks, and 

 with "a cluster of small, smooth-rimmed suckers" about the tips. 



2. Ommasirephids. — Teuthidoid Decaceres with free arms, with lach- 

 rymal sinuses, valviferous siphon, nuchal crests, and clavigerous clawless 

 tentacular arms " having four rows of suckers " about the middle of 

 the " club." 



3. Mastigoteuthids. — Teuthidoid Decaceres with free arms, without 

 lachrymal sinuses, with a valviferous siphon, without auditory crests, 

 and with tapering tentacular arms " covered with a multitude of minute 

 suckers, in many rows," towards the ends. 



4. CMroteutliids. — Teuthidoid Decaceres with free arms, with lachry- 

 mal sinuses, with a small siphon destitute of valve or dorsal bridle, with- 

 out nuchal or auditory crests, with very elongated clavigerous arms, 

 tipped •' with a spoon-shaped organ, opening backward " and " with 

 rows of singular ^mall suckers, having a swollen bulb on the long pedi- 

 cel" on the "club," buccal membrane seven-angled, and with six buc- 

 cal aquiferous openings. 



5. JSistioteuthids. — Teuthidoid Decaceres with the six upper arms 

 connected by a very extensive web, without lachrymal sinuses, a siphon 

 without valve or dorsal bridle, without nuchal crests, long clavigerous 

 tentacular arms "bearing large central, and small marginal suckers 

 and tubercles," buccal membrane " with six smooth lobes," and with 

 four buccal aquiferous openings. 



B. Taonoidea. — Decaceres with eyes naked and free-lidded, and very 

 prominent, without a true subterminal valve to siphon, and with the 

 mantle united to the base of the siphon as well as the back of neck by 

 three muscular commissures. 



6. Desmoteuthids. — Taonoid Decaceres with the body much elon- 

 gated, the siphon " with three peculiar special thickenings, or raised 

 processes, in its basal portion." 



Several other families of Myoi^sid Decaceres are found outside the 

 limits of Professor Verrill's field of investigation, but their place in the 

 system has not been determined as exactly as is desirable. Those 

 which have received names are the Loligopsidse, Cranchiidae, and 

 Thysanoteuthidse. 



C. Sepioidea. — Decaceres with eyes covered by transparent skin and 

 lidless, arms of the fourth pair hectocotylized, and with an internal flat- 

 tened calcareous gladius (sepiostaire or cuttle-fish bone). 



7. Sepiids. — The only known sepioid decaceres, and which furnish 

 the "cuttle-fish bone" of commerce. 



D. LoLiGiNOiDEA. — Decaccrcs with eyes covered by transparent ex- 

 tension of the cephalic integument and lidless, arms of the fourth pair 

 hectocotylized, and with an internal corneous gladius. 



8. Loliginids. — The only known American family. 



E. SpiRiJLorDEA or PhragtMOPHGRA. — Decaceres with eyes covered 



