I 



Mr. J. Miers on some of the Heliotropiege. 121 



EXPLANATION OF THE PLATES. 

 Plate LX. 



Fig. 1. First stage of development of Pagurus*. 



Fig. 2. Second stage. The author gives this with the reservation stated, 

 having taken it swimming in the open sea. c, dorsal view of 

 cephalon ; a, eye ; b, superior antennae ; c, inf. ant. ; d, mandible ; 

 g, posterior maxilliped ; h, first pair of gnathopoda ; I, second 

 pair ; k, first pair of pereiopoda ; I, m, n, o, three posterior pairs 

 of pleopoda ; p, q, t, pleopoda ; m, sixth pair of pleopoda ; z, telson. 



Fig, 3. Third stage, representing the genus Glaucothoe of Milne-Edwards 

 and Frophylax of Latreille : w, penultimate pair of pereiopoda ; 

 o, ultimate pair of pereiopoda \ p, a pleopod ; w, sixth or poste- 

 rior pair of pleopoda ; z, telson ; p, pleon of an older specimen. 



Fig. 4. Zoea of Porcellana platycheles : z, telson. 



Plate X. 

 Fig. 1. Phyllosoma. 

 Fig. 2. Zoea of Palinurus marinus. 



Plate XI. 



Fig. 1. Tgpton spongiosus, n. sp. References as above. 

 Fig. 2. Alpheus Edwardsii. 

 Fig. 3. Mandible of Nika edulis. 



Fig. 4. Homartis marinus. Development of flagellum to lower antenna. 

 Ftg. 5. Tanais : h, first pair of gnathopoda, with branchial appendage 

 attached. 



XI. — Observations on some of the Heliotropieae. 

 By John Miers, F.R.S., F.L.S., &c. 



In the ^ Prodromus ' of De Candolle we find the order Borra- 

 ginecB divided into four distinct tribes, the CordiecBj Ehretiecej 

 Ileliotropiecej and Borragece. Long before the appearance 

 of that work, the late Mr. R. Brown had pointed out, in his 

 ^ Prodromus/ p. 492, that the Cordiem ought to be held as a 

 distinct family, on account of their 4-fid style, and their seeds 

 without albumen, with plicated cotyledons — an opinion sup- 

 ported by Endlicher and Lindley for reasons which appear 

 sufficiently valid. Yon Martins rightly held that the perfectly 

 gynobasic style, placed in the middle of four distinct ovaries, 

 entitled the Borragece to rank as a separate natural order, and 

 accordingly he combined the two remaining tribes of DeCan- 

 doUe, the Ehretiece and HeliotropiecB^ in another family, which 

 he designated with the name of Ehretiacece. The uncertainty 

 and confusion in the distribution of the species in these several 

 groups have in great measure arisen from a neglect to examine 

 the structure of the fruits ; it may, however, be taken as a rule 

 that among the whole of them it is essential that the seeds 



* This was taken so young from the ovum that I am not certain whe- 

 ther the long projecting rostrum is a feature or not, as at this period it is 

 generally folded under. 



