286 Calliopiidae, Laothoes 



j Peraeopod 5 of moderate length, finger 



9 I curved 8. Gen. Calliopius p. 205 



1 Peraeopod 5 very elongate, finger straight 9. Gen. Paracalliope .... p. 297 



) Telson notched — 11. 



) Telson not notched — 12. 



, Side-plates 1 — 4 ratlier deep; mandible 



with cutting edge outdrawn .... 10. Gen. Harpinioid.es . . . . p. 298 



10 



11 



\ Side-plates 1-4 rather shallow ; mandible 



with cutting edge not outdrawn . . 11. Gen. Atylopsis p. 299 



I Antenna 1 longer than antenna 2 — 13. 

 ) Antenna 1 not longer than anteiHia2 — 14. 



I Body with some Segments dorsally dentale 12. Gen. Cleippides p. 30O 



\ Body without dorsally dentate segments 13. Gen. Stenopleui'a . . . . ji. 302 



j Side-plates shallow, 4th not deeper than Ist 14. Gen. Haliragoides .... p. 303 



14 ' Side-plates not very shallow, successively 



( deeper to the 4th 15. Gen. Apherusa p. 304 



1. Gen. Laothoes Boeck 



1871 Laothoes (Sp. nn.: L. meinerti), A. Boeck in: Forh. Selsk. (vhristian., 1870 

 p. 202 I 1876 L., A. Boeck, Skand. Arkt. Amphip., v. 2 p. 360 | 1890 L., T. Stebbing 

 in: Ann. nat. Hist., ser. 6 v.5 p. 194 | 1893 Laothoe (non J. C. Fabricius 1807, Lepi- 

 doptera!), G. O. Sars. Crust. Norway, v.l p. 453 [ 1893 Thoelaos, A. DellaValla in: 



F. Fl. Neapel, v. 20 p. 592. 



Side-plates not veiy large. Antennae 1 and 2 slender, antenna 1 

 the shorter, peduncle short. no accessoiy flagellum. Mouth-parts innch pro- 

 jecting. Upper lip rounded triangulär. Lower lip without inner lobes. 

 Mandible normal, strong, accessory plate on both, 3^ Joint of palp shorter 

 than 2'^. Maxiila 1, inner plate with 5 setae, outer with strong spines, palp 

 very small, 2<^ Joint rudimentarv, nodiform. Maxillipeds, inner plates normal» 

 outer very large, broad. reachiug almost to extremity of palp, with dentate 

 inner margin. Gnathopods 1 and 2 feeble, 5*^'' and 6*^ joints naiTow, rather 

 long, palm very short. Peraeopods 3 — 5, 2^ Joint oval, largest in peraeopod 5. 

 Uropod 2, onter ramus much the shorter; uropod 3. rarai long, subequal, 

 lanceolate. Telson entire. 



1 species aecepted, 1 uncertain. 



1. L. meinerti Boeck 1871 L. m., A. Boeck in: Forh. Selsk. Christian., 1870 

 ]}.202 I 187H L.m., A. Boeck, Skand. Arkt. Amphip., ii2 p.361 | 1893 L. m., Laothoem., 



G. O. Sars, Crust. Norway, v.l p. 454 t. 160 | 1893 Thoelaos meinertii, A. DellaValle 

 in: F. Fl. Neapel, ».20 p. 592. 



Body rather long and eylindric. Head, rostrum very small, lateral corners 

 deflexed, rounded, post-antennal quadrate. Pleon segment 3, postero-lateral 

 Corners almost quadrate, the margins slightly convex. Eyes oblong oval, widened 

 below, light red. Antenna 1 in g not half as long as the body, 1"^* Joint thick, 

 fcnuch longer than 2^ and 3'^ combined, flagellum setiferous. of many short joints, 

 about 4 times as long as peduncle. Antenna 2 considerably longer, ultimate 

 and penultiraate joints of peduncle subequal, flagellum fully thrice as long as 

 peduncle. Gnathopod 1, 5*^ Joint fusiform, as long as narrowly oblong 6*'\ palm 

 nearly transverse. scarcely half as long as bind margin. Gnathopod 2 rather 

 longer, 5*^ Joint widest distally, as long as the uarrow, almost linear 6*^. 

 Peraeopods 1 — 5 moderately slender, 2*^ Joint in peraeopods 3 — 5 with smooth 



