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HISTORY OR BRITISH CRUSTACEA. 
Gen. 79 . LEMBOS, Spence Bate . 
Upper antenna with secondary appendage small; first 
jaw-foot larger than the second ; third leg very short ; fifth 
very long. Telson rudimentary. 
Lembos Cambriensis, Spence Bate.— First hand with- 
out a thumb. 
Glamorganshire (Mr. Spence Bate). 
Lembos versiculatus, Spence Bate. — First hand with- 
out a thumb ; second scarcely prehensile, the fourth and 
fifth joints furnished with a strong brush. 
Plymouth (Mr. Spence Bate). 
Mr. Bate has described two other species from the South 
of England — L. Websterii and L. Danmoniensis — both fur- 
nished with a thumb on the first hand. 
Gen. 80 . LONCHOMERUS, Spence Bate . 
Like Lembos . Fourth joint of first jaw-foot produced 
into a long spine ; hence the name, from ^07^09 and jaepo 9. 
Lonchomerus gracilis, Spence Bate.— Spine of fourth 
joint of first jaw-foot as long as the fifth joint ; the fifth 
joint longer than the sixth ; the terminal claw ornate. 
