PROCBBDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 

 L^ffiVIMANUS group. 



'. Carpus of the small cheliped measuring always more than one-half of the 



chela in the adult (proportion included between 0.54 and 0.8, but may be 



reduced to 0.5 iu the young). 



6 \ Lateral spine of the basicerite smaller than that of the scaphocerite. 



c\ Fingers of the small chela each armed with three strong flat teeth, 



crossed in a vertical plane ; no trace of antennal scale ; spine of the 



scaphocerite shorter than the antennule; movable finger of the chela 



out of the perpendicular; eggs of large size 8. pectinigcr. 



c^. Fingers of the small chela with only two teeth; spine of the scaphocerite 

 equaling the antennule. 

 d ^. A trace of an antennal scale in the male ; carpus of the small cheliped 

 reaches 0.74 of the chela, diminishing to 0.5 and even a little less 



in the young »S*. longirarpus. 



d ^ An antennal scale in both sexes ; carpus of the small cheliped not 



exceeding 0.54 in the adult males 8. longicarpus appro.Hma. 



b^ Lateral spine of the basicerite equal to that of the scaphocerite, but both 

 shorter than the antennule ; antennal scale totally absent. 

 c\ Carpus measuring from 0.67 to 0.8 of the small chela. 

 d\ Proportion of T. L. : H.«=2.6:l to 2.5:1; meropodite of the small 



cheliped 3 to 3.3 times as long as wide 8. herricki. 



d'\ Proportion of T. L. : H.=2.7:l, the chela being more slender; 

 meropodite of the small cheliped four times as long as wide. 



>S'. herricki dimidiutus. 

 c^ Carpus measuring 0.65 of the small chela; proportion of T. L. : 



H.=3 :1 8. herricki angustipes. 



c". Carpus measuring 0.56 of the small chela, proportion of T. L. : H.= 

 3.2:1; carpocerite 5.4 times longer than wide (instead of 4.8 to 5) ; 

 feet of second and third p^irs one-fourth stronger than in the pre- 

 ceding forms 8. tanncri. 



^ Carpus measuring about one-half of the small chela in the adult (0.45 to 



0.52). 

 b ^. A well developed antennal scale in both sexes ; carpocerite 6.5 times 

 longer than wide ; meropodite of the third pair 3.8 times longer than 

 wide; small chela slender, proportion of T. L. : H. =3.33:1. 

 c\ Spine of the basicerite and of the scaphocerite shorter than the anten- 

 nule 8. pandionis. 



c". Spines equal to the antennule 8. pandionis cxientus. 



&^ No antennal spine. 



c\ Basicerite spinous above; carpus of the second pair with four seg- 

 ments 8. rathhunce. 



c^. Basicerite unarmed above. 



d \ Large chela 2.5 times longer than wide, its anterior palmar spine 

 directed obliquely downward ; supraorbital spines wide, leaving 

 between them and the rostrum U-shaped intervals; carpocerite 

 5.5 times longer than wide; meropodites of the third pair thick 



(proportion 3.3:1) ; eggs small; larvae zoese 8. grampusi. 



d'. Large chela 2.7 to 3.25 times longer than wide; anterior palmar 

 spine conical, directed obliquely upward; supraorbital spines ob- 

 tuse, divergent; meropodite of the third pair slender (proportion 

 4.3:1 to 4.5:1) ; eggs of large size; larvie mysis. 



"Total length to height (of large chela). 



