Dr. A. Philippics Zoological Notices. 



89 



/ 1. labrum ; in X maxilla ; I 2. labium ; 5 b. labrum ; 5 c. mandi- 

 ble ; 5 d. maxilla; 5 e. labium; 5/. antenna; 5 g. thorax and 

 basal joints of abdomen ; X prothoracic collar ; -f- mesothorax ; 

 metathorax. 

 Fig. 6. Carebara lignata, W. Mag. nat. 



6 a. mandible ; 6 b. maxilla; 6 c. labium ; 6 d. antennae. 

 Fig. 7 a. Thorax and basal joints of abdomen of Pheidole providens, W. ; 

 X prothoracic collar; + mesothorax; metathorax; 7 b. and 7 c. man- 

 dibles in different position. 



XIV. — Zoological Notices. By Dr. A. Philippi*. 



[With Two Plates.] 



1. On Clavagella balanorum, Scacchi. Plate III. fig. 1 — 6. 



CI. vagina adnata, abbreviata, apertura simplici ; valvis subtrian- 

 gularibus ; libera tenui, rugosa, parum convexa ; spinis fistulosis 

 irregularibus absconditis. 



Habitat in cespitibus Balanorum ad costam Pausilypi prope Nea- 

 polin. 



In December of the preceding year Sig. Scacchi made the 

 highly interesting discovery of this living species of Clava- 

 gella, and communicated it to the Royal Neapolitan Aca- 

 demy ; but since years will pass away before the Memoirs of 

 this Academy will appear in print, I believe I shall be doing 

 a great service to zoologists in giving a detailed description 

 of his discovery. We have examined the animal in company, 

 but the observation on the formation of the spinoid tubes is 

 due alone to Sig. Scacchi. 



The tube is short, at the most l± inch long, very thin 

 walled, and cohering most intimately with the surrounding 

 bodies (almost always Balanus balanoides) ; rarely does it pro- 

 ject one or two lines. It is compressed, measures about 2~ 

 lines in the one, 1 ±- — 2 in the other dimension ; its superior 

 (upper) aperture is simple ; it terminates inferiorly in general 

 in a pear-shaped expansion, in which the shell is situated. 

 This consists of a free and of an adhering shell. The free 

 shell is the right one ; it is of an irregular structure at the dor- 

 sal margin (Ruckenrande), frequently concave, and seldom ex- 

 ceeding 6 lines in length and 4 in breadth. It is thin and 

 very slightly vaulted, so that there is a wide space on the ven- 

 tral side between the two shells, which is closed by the thick 

 mantle of the animal. The lines of growth are very distinct, 

 and what is very remarkable, they do not run parallel with the 



* Translated from Wiegmann's * Archiv/ Part 2, June, 1840. 



