ISO 



bearing female of Parap. serratifrotis Borr. from Stat. 306, which I had sent to him. Having 

 received his observations and measurements, I conclude that this specimen must be referred to 

 Parap. serratifrotis Borr., for it only differs by a somewhat larger size and by the 

 carpus of the 2^"^ legs being of a darkbrown colour, while in Parap. serratifrotis it is 

 whitish. The specimen looks, as Dr. Tf.sch wrote me, rather poorly, is apparently badly 

 preserved, damaged and partly putrefied. The length from the orbital margin to the tip of the 

 telson is about 79 mm., in the largest measured specimen of Parap. serratifrotis only 67 mm.; 

 the other measurements are the following: 



Length of carapace from orbital to posterior margin: 18 mm. 



Length of rostrum as far as preserved: 27 mm. 



Length of abdomen without telson: ± 45 mm. 



Length of s''^ abdominal somite, measured dorsally: 6 mm. 



Length of 6'*^ abdominal somite: 13 mm. 



Maximum height of 6''> somite: 5,75 mm. 



Thickness of 6"' somite in the middle: 2,75 mm. 



Length of telson: 14 mm. 

 The endopodite reaches a little farther backward than the telson. The abdomen fully 

 resembles that of Parap. serratifrotis. Behind the orbital margin in de H.-\.vn's specimen five 

 teeth stand on the carapace and the teeth fully re.semble those of that species. 



The external maxillipeds, the penultimate joint of which is one and a half as long as 

 the terminal, reach beyond the antennal scale by the terminal joint and nearly one-sixth of the 

 penultimate; exopodite relatively as long as in the specimen of Parap. serratifrotis. The legs 

 of the 2"'' pair are equal, 43 mm. long; the carpus is 18,5 mm. long and 0,75 mm. thick at 

 its distal extremity, for the female of Parap. serratifrotis these numbers are 14 mm. and 

 0,58 mm., so that their proportion proves to be the same. In de Ha.-\n's specimen the 2"'' 

 legs, of which the carpus has a dark brown colour, reach almost as far forward as the external 

 maxillipeds, but in his description we read "maxillae quintae, pes primus sinister et pedes secundi 

 laminis ant. inf. multo longiores", like in Parap. serratifrotis. Of the three posterior legs, that 

 have no epipodites, the meri are armed with some distant spines; the three last joints (carpus, 

 propodus and dactylus) are wanting. 



The identification of de H.vax's species with Parap. spinipcs (Bate) [H. Balss, Ostasia- 

 tische Decapoden, II, 1914, p. 31] proves thus to be erroneous. 



Parapatidalus pristis (Risso) from the Mediterranean (Plate XIII, Fig. 35, 35^) bears 

 such a close resemblance to Parap. serratifrotis (Borr.), that I did at first hesitate to 

 regard the latter as a distinct species. I was, however, enabled to study three adult specimens, 

 a male and two egg-laden females, taken oft" Barcelona, belonging to the Leyden Museum, 

 and a young specimen from the Gulf of Naples (my private collection) and, thanks to these 

 specimens, I finally succeeded in discovering a character by which both species may easily be 

 distinguished, namely the entirely different shape of the dactyli of the three 

 posterior legs. Not only, indeed, are these joints in the Mediterranean species shorter 



