ANNOTATED LIST. 123 
Coloration varied but not often very dark orally; under arm-plates, at least 
proximally, with more or less whitish; arms long, 4.5 to 7.5 times disk 
CIAMOLER Certara nero ae ee Ee ee eee ee ee scolopendrina 
Coloration nearly or quite uniformly black; arms 4 to 5 times disk diameter erinaceus 
EE. Granulation finer, 36 to 64 granules per square millimeter; coloration without white 
or whitish; arm-spines 5 or 6. 
About 49 to 64 granules per square millimeter; adoral plates small; colora- 
tion very fine, variegated brown and yellow; arm-spines not notice- 
ablygflattenedvor curved R.scecist.enitrasscin cece ce enlaces See pica 
About 36 granules per square millimeter; adoral plates very large, nearly 
or quite meeting proximal to oral shield; coloration neither conspicuous 
nor variegated; arm-spines more or less flat, truncate, slightly curved 
dorso-ventrally and rather delicate............... 0.002002 ce eeueeees canaliculata 
DD. Tentacle-scale single, though there are often 2 on basal pores and even as far out as the 
fiftieth segment 2 may occur. 
E. No claviform upper arm-spines, though swollen ones may occur. 
F. Tentacles red; granulation of disk coarse, about 16 granules per square milli- 
meter; under arm-plates markedly wider than long; uppermost arm-spines 
long and slender, often equal to five segments..............2...2 20.0 eee eee riiset 
FF. Tentacles not red; granulation of disk finer, 16 to 36 granules per square milli- 
meter; uppermost arm-spines rarely equal to four segments. 
Coloration grayish black, often more or less variegated with whitish; size very 
large, up to 40 mm. disk diameter; tentacle-scales commonly 2 on basal 
IOTES We teteee cterstche cee eres ae Soles, ees crs Sess dn Mee Rice siete arate aethiops 
Coloration uniformly rich brown-black; no whitish; disk diameter rarely 
exceeds 22 mm.; tentacle-scales rarely 2 except on the first 1 to 3 pores. . schenleinit 
EE. Some upper arm-spines more or less markedly claviform.................-2++005 wendtit 
CC. Disk granulation very fine, 64 to 100 granules per square millimeter, covering oral inter- 
brachial areas. 
D. Coloration variegated. 
Prevailing colors green or greenish, and white or pale yellowish. ................. brevipes 
Prevailing tints gray or blackish or brownish, and whitish or pale brown. . brevipes var. variegata 
DD. Coloration uniformly deep brownish black. 
Jaws very short; oral plates greatly reduced; arm-spines 3 to 5 but often 6, mod- 
VALE ya LOW ea sere eee ckNS TT Ne ee aor caeaeie cee lor Siro susyers abate: SVRTE Teenie iS eat brevipes var. insularia 
Jaws long with evident oral plates; arm-spines 5, exceedingly long (5 to 6 mm.) 
BNGSIEN CERAM SE Soren ek StS One ly ORE eR eh brevipes var. longispina 
BB. Claviform spines few, 1 or 2 on each side near base of arm, not uppermost, but next to upper- 
ATIOS G1 Oly BELTICS ort anette eee sereter si orn eaecssec eves on ses eres orate ehacermeie avatensietesekcrer teeter atane pusilla 
AA. Disk granules, some or all, at least near disk-margin, higher than thick, becoming more or less 
markedly spiniform. 
B. Tentacle-scales single. 
C. Arms long, 6 to 10 times disk diameter. 
Arm-spines 4 or 5, uppermost or next, longest; under arm-plates with light areas dist- 
ally but these are rarely large and continuous enough to form a median light stripe pumila 
Arm-spines, 5 to 7, the third or fourth longest; a median light stripe on under sur- 
face'of'arm: almost always well marked). . «5.6 060 «0.6 06, sj. s o1e0 sensinerc esis cuss alexandri 
CC. Arms relatively short, 4 to 5.5 times disk diameter. 
Arms 5; disk granules low and thick, except near ae ; size large, disk 
diameter 2A) TAT ANSTO!) ese lie ofs.c ote es oie pares 210 odsielso) sraiai ents sie alsyere iafeteauereveralels valencie 
Arms 6; disk granules more or less spiniform; size small, about 5 mm. in diameter. . parva 
BB. Tentacle-scales 2; arms 5, not much more than three times disk diameter; color chocolate-brown bollonsi 
As one examines the above key and takes into consideration the geographical distri- 
bution of the different species and varieties, one is struck by the clear evidence of differentia- 
tion going on within the genus, tending to form three distinct groups, which may some day 
be regarded as genera. One of these, which may be called the brevipes group, extends 
across the Indo-Pacific region from Eastern Africa to Hawaii and Easter Island. It is 
easily recognized by the fine, close granulation of the disk which covers also the oral inter- 
brachial areas, and the presence of two tentacle-scales. The other two, which may be 
called the pumila group, known by a light coloration, commonly brown or green, and the 
more or less spiniform granules, and the scolopendrina group, recognized by spherical 
granules, more or less bare oral interbrachial areas, and dark or variegated coloration, 
occur not only in the Indo-Pacific region, but in the Panamic and West Indian regions as 
