[37] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
The ventral arms are trapezoidal in section at base, and rather stout. 
Breadth of front surface, near the base, exclusive of membranes, .55 of an. 
inch; transverse diameter, .95 of an inch; front to back, 1.25 inches. The 
sucker-bearing surface is, therefore, broader than in the other arms. 
The suckers are, however, distinctly smaller, and the proximal ones are 
different in form from the corresponding ones on the other arms. They 
are narrower and deeper, with more oblique and more contracted aper- 
tures, more oblique horny rims, which are denticulated on the outer mar- 
gins only. On the larger ones there are 12 to 15 sharp, incurved denti- 
cles. In fact, the proximal suckers on the ventral arms agree better 
with the middle suckers, beyond the 30th, on the other arms, for there 
are none having wide-open apertures, surrounded by nearly even liorny 
rims, denticulated all around. The suckers diminish regularly in size, 
and in the number of denticles, till at the 200th (where the arms are 
broken off) there are but three denticles. ; 
Young A. Harveyi, No. 24.—Measurements of arms (in inches). 
| | 
Near At At At At 
base. | 5 in. 10in. | 15in. | 20in. 
DORSAL PAIR. 
Breadth of front, excluding membranes........-.---}..-...-. As 7, . 50 ESO ues cde eee 
Breadth of lateral membranes. .......-----------se.s|...-.-5- 20 . 30 a se se ae 
Diameter, transversely ...---....0--.-s--s----eacese|.------- ~ 75 . 60 RGM eeaieiators- |laatelelatatale 
Piametertrom front tO DaCK~pab ste cdac seine sel ap mince ac aes 1. 05 . 90 AU Mee ec cee cee e 
SECOND PAIR. 
Sia ieal PUES Dyess ancl ate Meee istete wcleia «/a1s= leis sie (a) jbs/ciaia © HATIPANI. GES AS8|| 8S SSA ad ee en ddl meecce sd |=aoccene 
ee MLOlsthOU yes y= sacs sense = seeae eh ose aes ceo lather . 40 . 50 «35 .22 .18 
Peep Ot MON DEAN OS ta. cn colic sclisi-o <terclc'sedleetiaee|ol casas . 25 . 30 HOME ofa cect faietatinne ao 
RAO LE tilaS MELSBLYicsee nniviia canis are scasives os sei (soe clan: . 80 65 .35 . 30 .16 
Net eDer FCDING UO PUES. Saisie ate ma ace saee Sides es| can. 7 see 1.20} 1.20 . 85 . 60 - 40 
THIRD PAIR. 
exe uin OL MOM aes ee ce soc ccccinescdaccnccinc taceclas sed é DO . 50 ¢ 40! | easjemine lniscteererte 
Breadth of membranes A 20 =2D DE eee sone lesoccoss 
Diameter, transversely 1.10 . 70 eRe cob ad | sebcacad 
Diameter, front to back 1.08 1. 60 25:200:| 3S5 tee al east ae 
FOURTH PAIR. 
SEGA UMNOMMMOMG Sos see etna Setnetealecre ime miaeee ace deo celliotsunsce ate 40 . 55 Bit eee = = ae ere 
apaebror mem piuabestes secre l.scee. se aeteee ess colleo te . 20 2D 103 c2eceeesleecceses 
PHAAMELET ANS VOESOLY: <5 aa so 2 de chines vee bacteesallebeccons . 98 HOO) || Eb crete aialetere cmteiat [fates ale raloxn 
Miametervairont to paek: 2.44. .lccee occ ewde Culeeeweclecce secs 1. 40 up Dy Pe RSA | 
TENTACULAR ARMS. 
BaresWlenir this a2 tek est ws re Be ees eee 67 Le Li SP HESS ee ck | ee ren | RRP EDE Ree Eee 
HANH G0 /OXPANSION OL ClUD ne cnisecaccsuscedee accuse. SMM Series Ws Ss Na ee a creck, 
Diameter of slender portion........--.-...--.--.-.-. Ba ial al raed [eee ea ll ye 
LGD TIER es em ee Sear eee } ia gene meee ee SS: | eee en eee 
Length of part occupied by 24 largest suckers ...... QUIS EA RAP Ne Feo eee em nel ne Bears antec ce 
Length of part occupied by small distal suckers ....| 2.60 |........|......--|.-------|----eene|-oeceeee 
Greatest breadth of club ..2...-.-2 2.2.0.2. sees ee eee: STO eee ee meno lemons noe teen| a seccase 
Diameter, front to back.......--.-.---.-.- eee P60 doe Sale ae IR eb oal ak ee dees) Bs Se 
Sessile arms, from base to particular suckers. 
To To To To To To To To. 
25th. 50th. | 100th. | 150th. | 200th. | 250th. | 300th. tip. 
Dorsal pair, base to suckers........ 7.5 iy, Datel a8 en lll OE At ea OR neers ea) 
Second pair, base to suckers.....-.. 7.75 | 12.25) 16.75! 20.25 | 22.90| 24.50) 25.75 26. 25 
Third pair, base to suckers ........ Fis Gas |r ORO) Mi GON i a Th AEP NR a te 23 
Fourth pair, base to suckers. ....-. 6.25 | 10 AGCGOT MOON Tate ne coded eo. |o-cuccae Ree 
as 
