288 
C.C. Lu, A. Reid 
Figure 9 Distributions of Sepia plana sp. nov. (triangles), S. senta sp. nov. (solid circles), and S. sulcata Hoyle (open 
squares). The type locality of S. sulcata is indicated by a star (top right of figure). 
400-396 m, 24 Feb 1984, coll. S. Slack-Smith on RV 
"Soela", (WAM 346-86); IF (60.7 mm ML), North 
West Shelf, 18°33'S 117°36'E - 18°33’S 117°38'E, 
356-344 m, 17 Aug 1983, coll. RV "Soela", (MV 
F77198); IF (58.6 mm ML), North West Shelf, 
18°35'S 117°29’E, 404 m, 31 Jan 1984, coll. P. Berry 
& N. Sinclair on RV "Soela", (MV F77196); IF (67.3 
mm ML), N of Karratha, 18°44'S 116°59'E, 406-^04 
m, 23 Aug 1983, RV "Courageous", (WAM 4292- 
83). 
Diagnosis 
Cuttlebone oval; dorsally rough, with irregular 
calcified projections; thin chitinous film covers 
entire dorsal surface; spine absent; sulcus absent, 
anterior striae slightly convex to straight. Club 
with 6-8 suckers in transverse rows; suckers small, 
differ slightly in size; dorsal and ventral protective 
membranes not fused at base of club; joined to 
stalk; differ in length, ventral protective membrane 
terminates at posterior end of carpus, dorsal 
membrane shorter than carpus; swimming keel 
extends slightly beyond carpus. Left ventral arm 
hectocotylised in males: proximally a single row of 
normal suckers, followed distally by 8—11 rows of 
greatly reduced suckers, 2 dorsal series smaller 
than 2 ventral series; oral surface wide, fleshy; 
remaining suckers normal. Small to moderate 
species, maximum size to approximately 80 mm 
ML. Arm lengths subequal, suckers tetraserial on 
all arms. 
Description 
Counts and indices for individual specimens are 
given in Tables 4-5; ranges for arm length indices, 
arm sucker diameter indices and arm sucker 
counts are shown in Table 6. 
Small to moderate species, ML males 41.5 -53.9- 
61.6 83.2 mm (SD, 6.5), females 43.4 -61.6 -75.3 83.2 
mm (SD, 9.8). Mantle broad, oval (Figure 10A,B); 
MWI males 49.3-604-69.2 (SD, 7.5), females 55.5- 
62.6-69.9 (SD, 4.9); dorsal anterior margin 
triangular, obtuse; extending to anterior margin of 
eyes; AMHI males 14.3-18.9-25.1 (SD, 3.5), females 
14.4-20.7-26.8 (SD, 4.6). Ventral mantle margin 
emarginate, without distinct lateral angle; VMLI 
